Related Clues:
- Pollution-fighting org.
- D.C. watchdog
- U.S. air monitor
- Org. that does studies
- Factory-emissions testing grp.
- Tour group for swingers?
- Clean-air gp.
- Org. for Tiger and The Shark
- Noise pollution watchdog gp.
- Org. that conducts many studies
- Emissions watchdog: Abbr.
- Emissions tester, briefly
- Water tester: Abbr.
- DDT banner
- Mileage rating grp.