Related Clues:

• Org. that does studies
• Factory-emissions testing grp.
• Clean-air gp.
• Noise pollution watchdog gp.
• Org. that conducts many studies
• Emissions watchdog: Abbr.
• Emissions tester, briefly
• Water tester: Abbr.
• DDT banner
• Mileage rating grp.
• Drinking-water tester (Abbr.)
• 'Airplane!' cast member
• Pollution-control gp.
• DDT-banning org.
• Fed. smog watchdog