Related Clues:
- Federal agcy. since 1970
- Air watchers' gp.
- Org. that tracks mercury emissions
- Fed. watchdog hidden in 20-, 37-, 44- and 60-Across
- Superfund administrator
- Grp. concerned with m.p.g.
- Air-quality org.
- Mickelson's org.
- Ryder Cup org.
- Org. that features driving
- MPG rating group
- Org. whose Web site features a "Your Air Quality" map
- Gas mileage grp.
- Smog control grp.
- Emissions regulator: Abbr.