Fresno Bee Newsroom Blog

A small milestone on the road to eight-hour ozone cleanup

My Sunday story dwelled on the old one-hour ozone standard. The San Joaquin Valley appears poised to achieve it, thus wiping out a $29 million annual federal penalty.

Smoggy summer sky in Fresno.

But what about that other ozone standard — the eight-hour? It looks like this could be a rec0rd-setting year for it. That’s important, and I’ll tell you why in a minute.

First the numbers: If we have six or fewer October or November exceedances for this tougher, eight-hour standard, it would be the lowest total ever recorded here.

The Valley has 86 exceedances, as of Sunday. The record is 93 set in 2010.

Over the last five years, the Valley has averaged a little more than six October exceedances per year — ranging from only two in 2009 to nine in 2011. There have only been two exceedances in November over the last five years combined. There’s a chance the record would be set.

It’s important because it is progress, and we’re talking about human health. The threshold spans eight hours, which is a long time. It’s hard to prevent children or anyone else from being exposed to it at some point during a bad day.

Ozone is a corrosive gas that can scorch the lungs like a sunburn. Aside from triggering coughing and wheezing, it can cause heart arrhythmia that can lead to stroke.

Dozens of people die prematurely in the Valley each year due to ozone exposure, studies have shown. Bottom line, this is a dangerous air pollutant, and the Valley is still many years away from achieving the eight-hour standard for it.

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