New Weather System Curbs Air Pollution

A new weather system from the northwest began moving into Ventura County on Monday, easing temperatures and reducing air pollution that had soared to unhealthful levels in the worst smog episode of the year in Simi Valley.

Cool winds helped reduce pollution levels in Simi Valley from Sunday’s high of 119 on the Pollutant Standard Index to an 84 measurement Monday. Anything above 100 is considered unhealthful, while anything over 50 is considered moderate air quality.

The smog level in Simi Valley is expected to remain at about 90 today, meteorologists said.

“But that’s still not great, so it’s still best to exercise in the morning to avoid peak pollution from noon to 8 p.m.,” said Gary Arcemont, meteorologist with the Ventura County Air Pollution Control District.

Smog along the coast Monday measured a high of 55, contrasted with Sunday’s 62. It is expected to drop another five points today. Temperatures also were expected to cool a few degrees, with inland valleys in the mid 80s and coastal communities staying in the 70s.

Sunday was the third time that the county’s air exceeded federal health standards since the smog season officially began May 1, Arcemont said. The season runs through October.

Simi Valley air pollution levels reached 113 on the Pollutant Standard Index Aug. 3, and the smoggiest day so far this year was measured on May 9 at 131.

July, August and September are usually the worst months for smog. Last year, the county’s air violated federal health standards for ozone--the main component for smog--a mere 10 days, making it the cleanest year on record.

“So far, we’re looking better than last year,” said Richard Baldwin, director of the Ventura County Air Pollution Control District.