| Rater of m.p.g. | 15 |
| Pollution-rating gp. | 20 |
| Pollution-fighting gp. | 22 |
| Pollution-control grp. | 22 |
| Pollution watchdog org. | 23 |
| Pollution watchdog grp. | 23 |
| Pollution standards org. | 24 |
| Pollution monitor | 17 |
| Pollution control grp. | 22 |
| Pollution agcy. | 15 |
| Polluter-policing org. | 22 |
| Pollutant watchdog gp. | 22 |
| Pesticide-monitoring grp. | 25 |
| Pay-As-You-Throw org. | 21 |
| Org. with the blog Greenversations | 34 |
| Org. with lead concerns | 23 |
| Org. with an Office of Solid Waste and Emergency Response | 57 |
| Org. with an Office of Air and Radiation | 40 |
| Org. with an Assistant Administrator for Air and Radiation | 58 |
| Org. with an Acid Rain Program | 30 |
| Org. with air and water standards | 33 |
| Org. with a WasteWise program | 29 |
| Org. with a Sustainable Practices section on its website | 56 |
| Org. with a superfund | 21 |
| Org. with a radon hotline | 25 |
| Org. with a monthly "Go Green!" newsletter | 52 |
| Org. with a Greenversation blog | 31 |
| Org. whose Web site features a "Your Air Quality" map | 63 |
| Org. whose seal has a flower | 28 |
| Org. trying to clear the air? | 29 |
| Org. to be headed by Gina McCarthy, soon | 40 |
| Org. that's affiliated with fueleconomy.gov | 47 |
| Org. that tracks mercury emissions | 34 |
| Org. that registers pesticides | 30 |
| Org. that promotes motor oil recycling with the slogan "You dump it, you drink it" | 92 |
| Org. that oversees the Superfund | 32 |
| Org. that monitors oil spills | 29 |
| Org. that monitors fuel economy | 31 |
| Org. that may be involved in a cleanup | 38 |
| Org. that fines polluters | 25 |
| Org. that domes Springfield in "The Simpsons Movie" | 61 |
| Org. that does studies | 22 |
| Org. that directed some of BP's oil cleanup efforts | 55 |
| Org. that controls emissions | 28 |
| Org. that conducts many studies | 31 |
| Org. that cleans up spills | 26 |
| Org. tasked with enforcing the Clean Air Act | 44 |
| Org. protecting air and water | 29 |
| Org. of waste watchers | 22 |
| Org. monitoring industrial wastes | 33 |
| Org. linked to from the homepage of fueleconomy.gov | 51 |
| Org. launched by Nixon | 22 |
| Org. in a war against grime | 27 |
| Org. headed by W. D. Ruckelshaus | 32 |
| Org. headed by Ruckelshaus | 26 |
| Org. headed by Lisa Perez Jackson | 33 |
| Org. founded in 1970 | 20 |
| Org. fining polluters | 21 |
| Org. fighting grime | 19 |
| Org. doing atmospheric tests | 28 |
| Org. created under the Nixon administration | 43 |
| Org. concerned with the BP oil spill | 36 |
| Org. concerned with safe drinking water | 39 |
| Org. concerned with pollution | 29 |
| Org. concerned with PCBs | 24 |
| Org. concerned with mercury in fish | 35 |
| Org. concerned with hazardous waste | 35 |
| Org. concerned with greenhouse gases | 36 |
| Org. concerned with greenhouse gas | 34 |
| Org. concerned with fracking | 28 |
| Org. concerned with emissions | 29 |
| Org. concerned with air | 23 |
| Omega-3 fatty acid | 18 |
| Office of Air and Radiation parent org. | 39 |
| National Exposure Research Lab org. | 35 |
| MPG-rating grp. | 15 |
| MPG-determining group | 21 |
| MPG watcher | 11 |
| MPG watchdog | 12 |
| MPG rating agcy. | 16 |
| Mileage-testing grp. | 20 |
| Mileage testing grp. | 20 |
| Mileage rating grp. | 19 |
| Mike Leavitt is its head: Abbr. | 31 |
| M.P.G.-rating org. | 18 |
| M.P.G. watcher | 14 |
| M.P.G. determiners | 18 |
| Lisa Jackson's agcy. | 24 |
| Leavitt left it in 2005: Abbr. | 30 |
| Lead watchdog: abbr. | 20 |
| Lead monitor, for short | 23 |
| Its site has an Air Science page | 32 |
| It's got its standards: Abbr. | 33 |
| It's concerned with Hg emissions | 36 |
| It tests the waters: abbr. | 26 |
| It rates m.p.g. | 15 |
| It provides mileage ratings (abbr.) | 35 |
| Grp. with standards | 19 |
| Grp. that rates | 15 |
| Grp. setting standards | 22 |