OBITUARY: Prominent Calif. smog researcher dies at 93 Published: Thursday, June 26, 2014 James Pitts, a chemist whose research on smog helped set California's air quality standards, died last week. He was 93. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.