AQI
Set to 4 different clues across 5 published puzzles, most often “E.P.A. pollution meas.” — The New York Times, Thursday, 4 December 2008.
3 letters
Every clue on record, most used first
- E.P.A. pollution meas.2 times
The New York Times — Thursday, 4 December 2008
- Smog stat.once
The New York Times — Friday, 26 September 2008
- Atmospheric pollution meas.once
The New York Times — Thursday, 10 February 2005
- Pollution meas.once
The New York Times — Saturday, 14 November 1998