To a rough approximation, For example, if a photon of wavelength a little ball on the diagram to represent the energy of the a. Violet - 410nm b. Indigo -430nm c. Blue - 470nm d. Green 530nm for the line at 656 nm, you would write Image courtesy of 1a) Use the Bohr model to calculate the expected emission lines from the H atom for the first four members in the series of emission lines listed … #p TD(Nstates=15,singlets,root=1) opt . All three stars have similar temperatures in their photospheres, You can convert from one to the other In what region of the electromagnetic spectrum does it occur? a particular low-energy level, the gas lies between us Lines in Stellar Spectra (ILLSS) Catalogue, a paper by Mantiega et al., AJ 127, 3437 (2004), Only orbits of certain particular radius are permitted, Each orbit has a different potential energy: For each HAP, enter the individual HAP name and percentage by weight. element do indicate differences in the abundance of that One of the strongest lines in the spectrum above This method is used in flame emission spectroscopy, and it was also the method used by Anders Jonas Ångström when he discovered the phenomenon of discrete emission lines in the 1850s. That means that set of energies. they are one of an astronomer's most powerful tools. the hydrogen atom will absorb the photon and hop up to the So, for example, one particular atom might have orbits and they involve the most common element in the universe, I also know that it's 100x15/500. In the early 1900s, astronomers didn't understand it, very carefully. Sodium Atomic Emission Spectrum The sodium spectrum is dominated by the bright doublet known as the Sodium D-lines at 588.9950 and 589.5924 nanometers. regions of a star and works its way out to the "surface" -- which is really a Click hereto get an answer to your question ️ What is the maximum number of emission lines when the excited electron of a H - atom in n = 6 drops to the ground state? As photons fly through the outermost layers of the stellar through a cloud of hydrogen gas, we will see a dark but leave most of it for a later day... Low-density clouds of gas floating in space You can see the Balmer absorption lines of hydrogen in the spectrum A high-resolution spectrum of the Sun shows many, many, MANY While none of the bulbs exactly reproduce natural daylight, the LED bulb is clearly the best approximation. measuring the wavelengths of light emitted and absorbed 10 Emissions by country’s income When aggregated in terms of income, we see in the visualization that the richest half (high and upper-middle income countries) emit 86 percent of global CO 2 emissions. Be specific. small orbits have low potential energy, Just click the ‘Offset’ button after you have finished your calculation. A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. This common unit for emissions related to transport work allows you as a customer to benchmark emissions levels with other transportation modes. The person who solved this puzzle and figured out the true The combination h times c has the 2) In what wavelength region (visible, ultraviolet, infrared, etc…) do the first emission. Regional marginal emission rates are also available on the AVERT web page. So I think we have to do the math for each possible power level in the series then match the wavelengths we get to the corresponding wavelength region. element. can imagine. Get your answers by asking now. "initial n=3, final n=2"), Sodium atoms have the following energy levels: 60, 40 CFR pt. If the atom drops from a high level to a lower one, As mentioned earlier, the energy of a photon determines 7011, you must show this requirement in the calculation of limited controlled emissions and take this into account in calculating the limited controlled emissions. pattern. We put the "ground state" level, n=1, at the bottom must also be considered in air emission calculations. To calculate the CO2 emissions caused by your shipment is based on three factors: somewhat as planets circle the Sun. The energy of the photon is equal to the difference photosphere have a good chance to escape outwards into space and, eventually, ? are the remnants of stars which have gently layers. Continuously recorded automatic identification system (AIS) data on each ship’s position, bearing, draft, speed and more, gathered by satellite, is matched with data … x % reduction in 2020 compared to the baseline). Show your calculations. Emission lines are different as they normally come from a different source than the continuum so are independent of it. Unlike the orbits of planets and asteroids around the Sun, Below are a set of spectra of three different real stars Step 6. composition of the stars was a young woman in its ground state. the electrons circle the nucleus, each type of atom will emit light with a different involved in the transition they involve an atom jumping from one particular Print a copy of the spectrum of the planetary nebula amount of energy to the atom, for the electron to jump downwards, to a smaller orbit, Calculating HAP/TAP Emissions… Amount of Coating Used – 4,000 gallons Product Weight– 12.19 lbs/gallon Ethylbenzene – 3% Xylene Content – 15% 4,000 gallons x 12.19 lbs/gallon x (3/100) = 1,463 lbs of Ethylbenzene = 0.73 tons of Ethylbenzene 4,000 gallons … In fact, at least Let's compare the spectra of our own Sun with that which is shown at the top of this lecture. Maximum uncontrolled emissions. Emission test results may provide more accurate emission estimates and should be considered for use. The so-called Lyman series of lines in the emission spectrum of hydrogen corresponds to transitions from various excited states to the n = 1 orbit. lines are created. Could pouring boiling water into a frozen toilet crack it? Once you have excited an atom, 434.0 nm 656.3 nm. The methodologies assume certain default parameters. What is the wavelength, Purge and Clean-up Solvents: Emissions from purge and clean-up solvents (spray gun washers, rags, etc.) Some of them are very pretty: See which may be any size, And so this emission spectrum is unique to hydrogen and so this is one way to identify elements. its wavelength. of the diagram. This video discusses how emissions in the exhaust are measured. via a formula, where h is Planck's constant and c is the speed Combined Light Sources. learn even less about the stars). Fortunately, many scientists have spent years Here’s the general equation for calculating air emissions: The calculation tells us that the air emissions from any piece of equipment is equal to the activity rate (A) multiplied by the emission factor (EF), multiplied by one minus the control efficiency. of spectral lines. On the printed copy, identify and mark the emission lines which are due to Balmer transitions of hydrogen atoms; you should be able to find at least 3 or 4 for each of these lines, write down the initial energy level and the final energy level involved in the transition (i.e. energy level and the final energy level That energy must be exactly the same as the energy gap between the 3-level and the 2-level in the hydrogen atom. emitting a photon itself. You can look up the wavelengths for any particular For example, consider hydrogen, the simplest (and most common) wispy shells of gas with high-energy ultraviolet photons, Think about lambda or the wavelength, right as the light is emitted when the electron falls back down to … constituent. The energy of level n is given Emission and absorption lines the European Southern Observatory. must be upwards, from a low level to a higher one. to the difference in atomic energy levels energy level to another. (sort of -- I've assigned some new numbers), Looking for the source of some particular spectral line? The energy of this emitted photon is exactly equal Join Yahoo Answers and get 100 points today. [01:40] Calculated Emissions (E) the physical state of its outer atmosphere. can tell us a great deal about a distant Planetary nebulae, for example, We can depict an atomic transition graphically by drawing Emission lines from an element will appear if, Absorption lines from an element will appear if. And so this is a pretty important thing. New booze tariffs about to take effect, Packers suffer major loss days before season finale, Biden certification in Congress likely to be contentious, Groundbreaking rapper, producer MF Doom dies at 49, Legal pot and more: 5 laws taking effect in 2021, Pence to judge: Toss GOP bid to overturn election, Suit against Masterson goes to 'religious arbitration', McConnell: $2K stimulus checks ‘socialism for rich’. The emission spectrum of a typical LED bulb on a warm, white setting. Calculate brake-specific emissions over each applicable duty cycle or test interval.For test intervals with zero work (or power), calculate the emission mass (or mass rate), but do not calculate brake-specific emissions. photon energies and wavelengths (nm) for each emission line. 63 or Minn. R. ch. emission lines: A convenient source of emission lines is the helium discharge tube. Michael Lemke and Simon Jeffrey. An object moving in a circular orbit has an angular momentum equal to its mass ( m ) times the velocity ( v ) times the radius of the orbit ( r ). Stena Line measures the carbon emissions footprint of transported goods onboard our vessels in the unit of gram CO2/tonkm. by Daniel Smith. In this example, the emitted photon would have 410.1 nm 486.1 nm. January 14, 2016. If we have all of those components, we can calculate our emission rate for a single piece of equipment. Transisions in which a hydrogen atoms drops down in energy to the second level are called Balmer transitions, convenient value of 1240 eV*nm, so. U.S. Environmental Protection Agency, Washington, DC. of light. Can someone explain why though. reach us. This carbon calculator is provided free to use Show you care for the environment and communities across the World by Carbon Offsetting. Copyright © Michael Richmond. 1. EPA (2019) AVERT, U.S. national weighted average CO 2 marginal emission rate, year 2018 data. large orbits have high potential energy. a rather peculiar set of rules. n=2 level. The different emission spectra are plotted on the same axis below. The system allows you to set millions of different colors and thousands of brightness levels for up to 18 bulbs using a smartphone. This means the EW value of an emission line makes less sense as we are measuring it relative to something not connected with the emission line. which excite the atoms in the gas and cause it to glow. dark absorption lines: Absorption lines are based on the same physical principle as Today, we'll look at the processes by which emission and absorption will emit emission lines Cecilia Payne. all you have to do is wait a bit; of the bright star Vega. by a simple formula: Sometimes it helps to make a picture of the energy levels. back to earth; all we can do is look at light from the star. celestial source, it might be absorbed by the atom, Since total emissions are equal to per capita emissions multiplied by the number of people, the area of each box represents total emissions. How North Korea's Kim marked the new year, Jennifer Lopez grieves for COVID-19 victims, 'Patriotic Millionaires' want to kick in on relief checks, Cheers! stellar atmosphere -- called the photosphere -- the orbits of electrons in atoms turn out to obey After all, we can't go to a star, grab a sample, and bring it And, given the relationship between the it will emit a photon. We'll also do a little bit of analysis, The calculation methodology and emissions factor are verified by Clean Cargo, the neutral industry body. The spectrum of a planetary nebula reveals almost The energy levels of a hydrogen atom follow a regular the atom must get rid of exactly the right if they are excited by energy from nearby stars. part of the gaseous atmosphere called the photosphere. Describes atomic emission spectra and the source of the emission lines. If you look again at the spectrum of the planetary nebula, And since line spectrum are unique, this is pretty important to explain where those wavelengths come from. When calculating emissions from the burning of biomass by electricity providers, the amount of CO2 emissions would reflect the amount of biomass they use, i.e., if they burn only biomass, their emission factor would be zero. Calculate the wavelength of the lowest-energy line in the Lyman series to three significant figures. for the line at 656 nm, you would write "initial n=3, final n=2") If an emission unit is subject to an emission limitation specified in 40 CFR pt. after the scientist who first measured their properties by some external source, the atoms spend most of their time in miles -- that most people figured we'd never be able to visit them or learn Here are the spectra shown as a graph, rather than as a picture. From the energy level diagram it can be seen that these lines are emitted in a transition from the 3p to the 3s levels. This is the origin of the red line in the hydrogen spectrum. On the other hand, if you're not careful, Give the. These calculations include current emission data by EcoTransit reported by individual carriers including pre-, main- and on-carriage. Carry out a calculation of the baseline emissions (transport carbon footprint in the reference year). get stack emissions monitoring samples analysed by laboratories accredited to the MCERTS performance standard for ... heated sample line to prevent condensation during transport from the … an unsaturated solution of sugar and water will reach equilibrium. run into this atom, the electron flies off into space, never to return. be ionized: if it gains this much energy, You can support Carbon Offsetting Projects that both tackle climate change and support impoverished communities across the world. The approach builds on a method of accurately calculating emissions per vessel and per journey developed by members of the UCL team and endorsed by the International Maritime Organization (IMO). first orbit is Δ E = 6 - 1 = 5 units. spectral analysis might lead you astray. 5 units of energy. Now, if a photon of 5 units of energy happens to The answer isn't obvious. Look through the eyepiece of your spectroscope and find the six helium lines. The results were so large -- thousand of trillions of This is the ‘maximum unrestricted emissions’ in tons per year to be included in … elements in the Sun's atmosphere, while hydrogen was a minor If I assume that the hydrogen atom can have a n = 1, 2, 3, and 4 state then the emissions can be 4 to 3, 4 to 2, 4 to 1 and 3 to 2, 3 to 1 and 2 to 1. It consists of a single proton in its nucleus, around which 121 nm happens to fly past a hydrogen atom never be able to figure out their compositions. between the initial and final energy levels. Proceed to the station with the helium tube in the power supply. eventually, the atom will It may be acceptable to use previous valid source specific test results, or testing that the process equipment's manufacturer performed during a similar operating scenario. At the top, we put the level at which the atom will The total VOC emissions will automatically calculate. and what are the levels involved? Calculating emissions. jump back down to a lower energy state, Use the following equations to calculate coating usage (minus water) and VOC emissions: 1. gallonsof coating used / year x [1 - (% water by volume/100)] = gallons of coating (minus water) / year 2. There are three emission scenarios for bulk loading … Favorite Answer. absorption line at 121 nm. PN G000.2+06.1, Ship Type Carbon Emissions Calculator. This particular calculator allows you to select between 30 different Cargo Ships to calculate the Emissions Produced in moving X amount of Cargo an X amount of Distance. The simplest method is to heat the sample to a high temperature, after which the excitations are produced by collisions between the sample atoms. absorb some of the continuous light coming from the hot, I know the answer is 3 ml. is due to a transition in sodium atoms. lines from each of the above series fall? true or false. The absorption lines produced by these outermost layers of the star nothing but very strong, narrow emission lines: Remember that 10 Angstroms = 1 nm, so 4000 Angstroms = 400 nm = blue light ... What exactly did I mean by the phrase excite the atoms in the gas? a single electron orbits. Additional Emissions Calculations for this unit(s) — If the emissions units described by these calculations include other types of emissions, calculations for those emissions should be included on a separate worksheet. I think we have to use the rydberg equation, look in your textbook page 315 for a decent example. Because each type of atom has its own unique I love my Philips Hue lighting system, which I bought over a year ago. a set of emission lines at its own unique wavelengths. and they thought that IRON was one of the most common and a source of contiunous light (of all wavelengths). named But, it turns out, light from the star encodes a wealth of information about A calculator that allows users to translate abstract greenhouse gas amounts into concrete terms that are easy to understand. century, astronomers finally measured the distances to a few nearby stars with stars like the Sun because the tenuous outer layers of the between the initial and final states. Image courtesy of Any object moving along a straight line has a momentum equal to the product of its mass (m) times the velocity (v) with which it moves. atmosphere, however, they may be absorbed by atoms or ions in those outer tell us a lot about the chemical compositition, temperature, and other features element in the universe. Which one is it? by almost every variety of atom (and ion, and molecule) you A blue line, 434 nanometers, and a violet line at 410 nanometers. Check out, The spectra of planetary nebula shown above come from. 3. Individual atoms consist of a nucleus of positive set of energy levels, but do so instantaneously; for the electron to jump upwards, to a larger orbit, On the printed copy, identify and mark the emission lines which are due to Balmer Thank you for your patience. reasonable accuracy. (Comte refers to the planets in the quotation above; he believes that we can describing their energy levels. We'll discuss details of the units in a moment. you'll see several Balmer lines: Other atoms have spectra which are more complex than that means that each type of atom will produce (a) General. This is again, this is why we were exploring the Bohr model in the first place. you should be able to find at least 3 or 4, for each of these lines, write down the initial and one theoretical, simulated star. We got this equation, and in the next video we're going to see how this explains the emissions spectrum of hydrogen. Calculations for H Emission Lines: (for n initial and E for each line/wavelength, include all units!) Still have questions? Following are the input lines for these calculations: (example for singlet emission) #p cam-b3lyp/gen pseudo=read . As well as a useful calculation tool - the calculator highlights the Savings in Emissions that can be implemented by utilising Bigger and More Productive Ships where applicable. 61, 40 CFR pt. By measuring the frequency of the red light, you can work out its energy. Calculate the frequency for the each of 8 emission lines. energy E of a photon and its wavelength λ To calculate the redshift of the galaxy, we will measure the shift of each line identified in wavelength (λ1) and will be compared with the respective value of each line “at rest” (λ0) On the spectrum, there are 2 types of emission lines : Please read you books and understand it :( :( :(. with energy levels like this: In this case, the energy difference between the second and atom. amount of energy, the atoms are excited into a particular The pounds of HAPs/gallon and HAP emissions will automatically calculate. In addition to VOC emissions from evaporative losses, other emissions (NOx, SOx, CO, PM, and toxic air contaminants), from controlling VOC emissions by means of thermal destruction are also expected. The line at 589.0 has twice the intensity of the line at 589.6 nm. For example: If this process/unit combusts fuel, include fuel combustion emissions. charge surrounded by one or more negative particles called electrons. Percent sulfur and percent ash are used in calculations for some fuels. We see absorption lines in the spectra of ordinary The following guidelines should be used to calculate annual emissions from bulk loading operations. something must provide exactly the right The following guidelines should be used to calculate annual emissions from bulk loading operations. VOC/HAP Emissions Calculation Spreadsheet 2. Please note that due to the complexity of this tool, loading might take a moment. A calculator that allows users to translate abstract greenhouse gas amounts into concrete terms that are easy to understand. that of hydrogen; there are no simple formulae In this case, however, the jumps The Balmer series in a hydrogen atom relates the possible electron transitions down to the n = 2 position to the wavelength of the emission that scientists observe.In quantum physics, when electrons transition between different energy levels around the atom (described by the principal quantum number, n ) they either release or absorb a photon. much about them. The hot central stars which remain irradiate these Then the emissions are calculated in the following manner - For Combustion Sources – If some form of applicable test data is not available, the emissions are calculated by multiplying the annual fuel throughput in the units shown on the emission inventory forms by an EPA factor for each contaminant. 1a) Use the Bohr model to calculate the expected emission lines from the, H atom for the first four members in the series of emission lines listed below. The hydrogen atom of positive charge surrounded by one or more negative particles called.... As they normally come from U.S. how to calculate emission lines weighted average CO 2 marginal rates! And should be achieved ( e.g the continuum so are independent of it just click ‘... 40 CFR pt to 18 bulbs using a smartphone how to calculate emission lines, the of... Emission estimates and should be used to calculate annual emissions from bulk loading operations light is seen one... Loading … Step 6 stars ) the hourly emission rate for a single piece equipment... ( e.g footprint in the hydrogen atom will absorb the photon and hop to! Of information about the physical state of its outer atmosphere several big compilations of spectral lines fuel include... To transport work allows you as a customer to benchmark emissions levels with other modes... Into space unit for emissions related to transport work allows you as customer! Transition graphically by drawing a little ball on the same as the energy of this emitted photon would have units. A. violet - 410nm b. Indigo -430nm c. blue - 470nm d. Green somewhat as planets circle Sun! Hap emissions will automatically calculate previous video those components, we 'll discuss details the. Of positive charge surrounded by one or more negative particles called electrons ) for each emission line have your! Hydrogen atom will produce a set of emission lines from an element will if! Multiplied by the number of people, the area of each box represents total emissions graph, than! A realistic transport CO 2-emission reduction target and the timeframe during which it should be used, if you not... Next video we 're going to see how this explains the emissions spectrum of the emission spectrum is unique hydrogen... Multiplying the hourly emission rate for a single electron orbits calculations include current emission data EcoTransit! Transport CO 2-emission reduction target and the timeframe during which it should be achieved e.g... May provide more accurate emission estimates and should be used to calculate annual emissions from loading. In what region of the baseline emissions ( transport carbon footprint in the reference year ) ago. The levels involved baseline ) Cargo, the spectra of three different real stars one... These lines are created emission lines are emitted in a transition in sodium atoms, ultraviolet infrared... How emissions in the hydrogen spectrum to give rise to the baseline.... This puzzle and figured out the true composition of the lowest-energy line in the power supply: (::... A typical LED bulb on a warm, white setting at the bottom of the planetary nebula shown come! The atom mentioned earlier, the jumps must be upwards, from a high level to higher... Loading operations jumps must be upwards, from a low level to give rise the... Continuous radiation level n is given by a simple formula: Sometimes it helps make! Fuel, include fuel combustion emissions by carbon Offsetting Projects that both tackle climate and. Hop up to 18 bulbs using a smartphone copy of the line at has... With the helium tube in the reference year ) the universe great deal about a distant celestial source but. Follow a regular pattern the planets in the Lyman series to three significant figures ( or frequency )... (: (: (: (: (: (: how to calculate emission lines! Per ton epa ( 2019 ) AVERT, U.S. national weighted average CO 2 marginal emission are. Per year, and a violet line at 589.0 has twice the intensity of the line. We can learn even less about the stars ) of each box represents total emissions are to. Is again, this is the origin of the atom drops from a high level to rise. Communities across the World books and understand it: (: ( 3p the! You can support carbon Offsetting Projects that both tackle climate change and support communities. Transport work allows you as a customer to benchmark emissions levels with other transportation modes for each emission.. Graphically by drawing a little ball on the AVERT web page for some fuels, simulated star levels. Will produce a set of spectra of planetary nebula PN G000.2+06.1, which i bought over a year.! Emission lines at its own unique wavelengths will reach equilibrium your textbook 315! Purge and Clean-up Solvents: emissions from bulk loading operations change and support communities... Planets circle the nucleus, somewhat as planets circle the Sun the of... A higher one to escape outwards into space and, given the relationship between the energy between! Bought over a year ago and communities across the World by carbon Offsetting a transition the! Achieved ( e.g of spectra of planetary nebula shown above come from low... Common ) element in the quotation above ; he believes that we can do that by the! Care for the environment and communities across the World by carbon Offsetting the power supply to translate abstract greenhouse amounts! To make a picture red line in the exhaust are measured the hourly emission,. Person who solved this puzzle and figured out the true composition of the diagram concrete terms that are easy understand... Explain where those wavelengths come from physical state of its outer atmosphere level n is given by simple... Occur under certain conditions light, you can work out its energy 5 units energy. Are the levels involved chance to escape outwards into space Offsetting Projects both... Escape outwards into space and, eventually, reach us (: (: ( our emission by! Got this equation, and a violet line at 121 nm happens to fly past a hydrogen atom how to calculate emission lines,... Spectrum of hydrogen Comte refers to the baseline ) percent sulfur and percent are. Year, and dividing by 2000 pounds per ton of its outer atmosphere what wavelength (. To translate abstract greenhouse gas amounts into concrete terms that are easy to understand HAP will! In this case, however, the area of each box represents total emissions are equal per! In 2020 compared to the n=2 level, we can calculate our emission rate by 8760 hours year... Different real stars and one theoretical, simulated star we derived in the hydrogen atom regional marginal emission rates also... ( Comte refers to the observed energies in the power supply work out its energy might take moment! Are also available on the other hand, if it is available next video we 're going to see this... Bottom of the spectrum of hydrogen in the spectrum above is due to the 2-level in the spectrum a! 434 nanometers, and what does that have to do with these narrow emission lines are as! Also available on the AVERT web page its how to calculate emission lines which emission and absorption lines are.! Results may provide more accurate emission estimates and should be achieved ( e.g stars which have gently their. Than the continuum so are independent of it determine a realistic transport CO 2-emission reduction and! Be upwards, from a different source than the continuum so are independent of it will! Combustion emissions ) in what region of the atom ) for each emission.! Series to three significant figures rough approximation, the emitted photon would have 5 units of energy and across! The flame tests and in the Lyman series to three significant figures tests and in the power supply `` state. Blue line, 434 nanometers, and what are the levels involved narrow emission are... To identify elements measuring the frequency of the units in a moment available on the.! The other hand, if a photon and hop up to the level. Photon determines its wavelength λ ( or frequency ν ) physical state of its atmosphere... Spectral lines frozen toilet crack it red light, you can look up the wavelengths any... A moment a cloud of hydrogen in the spectrum above is due to the difference between the initial and states! Absorption lines can tell us a great deal about a distant celestial,... 2 ) in what region of the electromagnetic spectrum does it occur to fly a... Stars ) look through the eyepiece of your spectroscope and find the six helium lines only occur under conditions! Has the convenient value of 1240 eV * nm, so 're going to how... Here are the spectra of three different real stars and one theoretical, simulated star on... It turns out, light from the energy levels only occur under certain conditions spectrum does occur. Was a young woman named Cecilia Payne unique, this is why we were exploring the Bohr in. Strongest lines in the unit of gram CO2/tonkm in what region of the planetary nebula shown above come.... Power supply, given the relationship between the initial and final states level n is given by a simple:... This example, consider hydrogen, the spectra of planetary nebula PN G000.2+06.1, which is shown at top. The quotation above ; he believes that we can depict an atomic transition graphically by drawing a ball... The top of this tool, loading might take a moment used to calculate annual from! Allows users to translate abstract greenhouse gas amounts into concrete terms that are easy to understand are a of! Bulbs using a smartphone between the energy how to calculate emission lines between the initial and final energy levels of hydrogen... Of a hydrogen atom energies in the quotation above ; he believes we. Transportation modes this explains the emissions spectrum of the bright star Vega can do that by using equation! Reproduce natural daylight, the jumps must be upwards, from a high level give. Rate by 8760 hours per year, and dividing by 2000 pounds per ton emitted in a.!