| Org. with the Office of Solid Waste and Emergency Response | 58 |
| Org. with an acid rain hotline | 30 |
| Org. with a Pollution Prevention Grant | 38 |
| Org. that began the Energy Star program | 39 |
| Org. concerned with PCB's | 29 |
| Org. concerned with global warming | 34 |
| Org. concerned with CFCs | 24 |
| Oil spill-monitoring org. | 25 |
| MPG rating agency | 17 |
| MPG agency | 10 |
| Green grp. | 10 |
| Gp. with emission standards | 27 |
| Gp. interested in clearing the air | 34 |
| Govt. watchdog group | 20 |
| Govt. smog watchdog | 19 |
| Govt. org. with a flower in its logo | 36 |
| Govt. ecology group | 19 |
| Govt. agency since 1970 | 23 |
| Gov. air-monitor | 16 |
| Fuel efficiency rater: Abbr. | 28 |
| Fed. regulator since 1970 | 25 |
| Fed. pollution monitor | 22 |
| Fed. cleaner-upper | 18 |
| Environmental protection org. | 29 |
| energystar.gov grp. | 19 |
| energystar.gov gp. | 18 |
| Energy Star org. | 16 |
| Emissions watchdog: Abbr. | 25 |
| Emissions watchdog (abbr.) | 26 |
| Ecol. monitor | 13 |
| Earth Day org. | 14 |
| Drinking-water tester (Abbr.) | 29 |
| D.C. watchdog | 13 |
| Clean air gp. | 13 |
| Clean Air Act enforcer | 22 |
| AQI calculator | 14 |
| Antipollution gp. | 17 |
| Air-quality monitoring org. | 27 |
| Air-quality monitor: Abbr. | 26 |
| Air-monitoring org. | 19 |
| Air quality watchdogs: abbr. | 28 |
| Air pollution watchdog | 22 |
| Air grp. | 8 |
| Agency that banned DDT | 22 |
| Agcy. twice headed by Ruckelshaus | 33 |
| Abbr. in many car ads | 21 |
| William Ruckelshaus was its first head: Abbr. | 45 |
| Wetlands watchdog | 17 |
| Wetlands protection org. | 24 |
| WaterSense agcy. | 16 |
| Water-quality org. | 18 |
| Water watchdog, briefly | 23 |
| Water watchdog | 14 |
| Water tester: Abbr. | 19 |
| Water quality org. | 18 |
| Watcher of the skies: abbr. | 27 |
| Watcher o'er wetlands | 25 |
| Watchdog gp. proposed by Nixon | 30 |
| Watchdog agency's intitals | 30 |
| Waste watchers' org. | 24 |
| Waste watcher's org. | 24 |
| Walter Peck's org. in "Ghostbusters" | 50 |
| UV index tracker | 16 |
| UV index monitor, for short | 27 |
| U.S. watchdog agcy. | 19 |
| U.S. pollution controller | 25 |
| U.S. air pollution monitor | 26 |
| U.S. air monitor | 16 |
| U. S. ecology org. | 18 |
| Trash trackers: Abbr. | 21 |
| Trash trackers (abbr.) | 22 |
| Toxic avengers (abbr.) | 22 |
| They watch for PCB's | 24 |
| They got the lead out: abbr. | 28 |
| Test-conducting org. | 20 |
| Sustainable practices grp. | 26 |
| Superfund administrator | 23 |
| Spill-handling org. | 19 |
| Spill-fighting grp. | 19 |
| Spill-fighting gp. | 18 |
| Spill checker, briefly? | 23 |
| Smog-watching grp. | 18 |
| Smog-regulating grp. | 20 |
| Smog-monitoring org. | 20 |
| Smog-monitoring gp. | 19 |
| Smog-fighting grp. | 18 |
| Smog-battling org. | 18 |
| Smog watchdog (abbr.) | 21 |
| Smog fighters, for short | 24 |
| Smog control grp. | 17 |
| Smog control gp. | 16 |
| Sierra Club e.g. | 16 |
| Safe Drinking Water Act enforcer, for short | 43 |
| Russ Cargill's org. in "The Simpsons Movie" | 57 |
| Ruckelshaus's agcy. | 23 |
| Regulating org. | 15 |
| Reg. agency | 11 |
| Ratings org. | 12 |
| Raters of m.p.g. | 16 |
| Rater of MPG | 12 |