| Oil spill-monitoring org. | 25 |
| Gp. with emission standards | 27 |
| Govt. agency since 1970 | 23 |
| Fuel efficiency rater: Abbr. | 28 |
| Fed. regulator since 1970 | 25 |
| Fed. pollution monitor | 22 |
| Environmental protection org. | 29 |
| Emissions watchdog: Abbr. | 25 |
| Emissions watchdog (abbr.) | 26 |
| Drinking-water tester (Abbr.) | 29 |
| Clean Air Act enforcer | 22 |
| Air-quality monitoring org. | 27 |
| Air-quality monitor: Abbr. | 26 |
| Air quality watchdogs: abbr. | 28 |
| Air pollution watchdog | 22 |
| Agency that banned DDT | 22 |
| Wetlands protection org. | 24 |
| Water watchdog, briefly | 23 |
| Watcher of the skies: abbr. | 27 |
| Watcher o'er wetlands | 25 |
| Waste watchers' org. | 24 |
| Waste watcher's org. | 24 |
| UV index monitor, for short | 27 |
| U.S. pollution controller | 25 |
| U.S. air pollution monitor | 26 |
| Trash trackers (abbr.) | 22 |
| Toxic avengers (abbr.) | 22 |
| They watch for PCB's | 24 |
| They got the lead out: abbr. | 28 |
| Sustainable practices grp. | 26 |
| Superfund administrator | 23 |
| Spill checker, briefly? | 23 |
| Smog fighters, for short | 24 |
| Ruckelshaus's agcy. | 23 |
| Pollution-fighting gp. | 22 |
| Pollution-control grp. | 22 |
| Pollution watchdog org. | 23 |
| Pollution watchdog grp. | 23 |
| Pollution standards org. | 24 |
| Pollution control grp. | 22 |
| Polluter-policing org. | 22 |
| Pollutant watchdog gp. | 22 |
| Pesticide-monitoring grp. | 25 |
| Org. with lead concerns | 23 |
| Org. with a WasteWise program | 29 |
| Org. with a radon hotline | 25 |
| Org. whose seal has a flower | 28 |
| Org. trying to clear the air? | 29 |
| Org. that monitors oil spills | 29 |
| Org. that fines polluters | 25 |
| Org. that does studies | 22 |
| Org. that controls emissions | 28 |
| Org. that cleans up spills | 26 |
| Org. protecting air and water | 29 |
| Org. of waste watchers | 22 |
| Org. launched by Nixon | 22 |
| Org. in a war against grime | 27 |
| Org. headed by Ruckelshaus | 26 |
| Org. doing atmospheric tests | 28 |
| Org. concerned with pollution | 29 |
| Org. concerned with PCBs | 24 |
| Org. concerned with fracking | 28 |
| Org. concerned with emissions | 29 |
| Org. concerned with air | 23 |
| Lisa Jackson's agcy. | 24 |
| Lead monitor, for short | 23 |
| It tests the waters: abbr. | 26 |
| Grp. setting standards | 22 |
| Grp. monitoring emissions | 25 |
| Grp. involved in a cleanup | 26 |
| Grp. concerned with pollution | 29 |
| Grp. concerned with m.p.g. | 26 |
| Green org. with a floral logo | 29 |
| Green monitor, for short? | 25 |
| Gp. concerned about emissions | 29 |
| Govt. pollution watchdog | 24 |
| Govt. antipollution org. | 24 |
| Govt. air-quality watchdog | 26 |
| Government org. since 1970 | 26 |
| Government agcy. est. in 1970 | 29 |
| Frequent GOP debate target | 26 |
| Federal ecology agency | 22 |
| Federal agcy. since 1970 | 24 |
| Fed. pollution watchdog | 23 |
| Fed. conservation org. | 22 |
| Fed. clean-air watchdog | 23 |
| Fed. agency since 1970 | 22 |
| Environmentalists' org. | 27 |
| Environmental watchdog agcy. | 28 |
| Environmental protection grp. | 29 |
| ENERGY STAR promoter, briefly | 29 |
| Energy Star program creator | 27 |
| Emissions-standards grp. | 24 |
| Emissions-regulating org. | 25 |
| Emissions watchdog, for short | 29 |
| Emissions watchdog org. | 23 |
| Emissions watchdog gp. | 22 |
| Emissions tester: Abbr. | 23 |
| Emissions tester, briefly | 25 |
| Emissions regulator: Abbr. | 26 |