Fresno Bee Newsroom Blog

Record-setting summer for air quality, but it’s still worst in country

I’m still thinking about ozone and the summer of 2013. I think the good news in California is also the bad news.

The good? Both the San Joaquin Valley and the South Coast Air Basin are poised to set all-time records for the least number of bad days — 86 in the Valley and 90 in South Coast, so far.

The bad? South Coast’s lowest-ever number of eight-hour ozone exceedances is still the worst in the country this year. The Valley’s lowest-ever is second worst. And third place is not even close to South Coast or the Valley.

Antelope Valley is third with 64 exceedances. Coachella Valley is fourth with 48. Houston is fifth with 20.

I checked the number of exceedances for the one-hour ozone standard, too. The Valley has not breached the standard this year, which would be a first if it holds up through the end of the warm season.

South Coast, which includes Los Angeles, Riverside, San Bernardino and Orange counties, had four exceedances of the one-hour standard. Houston had one. I found no others.

Will the Valley dip below 100 dirty-air days this year?

Fresno’s gritty skyline this September.

The San Joaquin Valley might not exceed the eight-hour federal ozone standard 100 times this year — not exactly a success story anywhere in the country except here or Southern California.

But it is news. It has only happened twice here, according to the records. In 2009, the count was 98. In 2010, it was an all-time low of 93.

The only problem is the weather can be cruel in late September. The last four days of September 2010 were triple-digit nightmares.

The heat continued sporadically that year. There were 10 exceedances after Oct. 1 in 2010 — two of them after Nov. 1.

Flash forward to this year. The total is 77 on Sept. 13. It was 74 on that day three years ago. So there’s a chance the total will be below 100 exceedances this year.

I usually add something about the target being zero exceedances. For now, I’d settle for a shutout for the rest of September, October and November.