The local air board is planning to soften new restrictions that could stop wood-burning in fireplaces most of the winter in Fresno and Bakersfield.
Wood-burning will be allowed on some no-burn days, leaders said Thursday. But an EPA-certified wood-burning device, such as a stove or heater, would have to be used.
The district will hold public hearings to determine the threshold.
Starting in 2014, the new burn bans will be triggered when soot and other debris reaches 20 micrograms per cubic meter of air. Right now, the threshold is 30.
The exemption level for people using EPA-certified devices will probably be 30 to 35, I’m told.
On an even more technical note, the new restrictions are part of the district’s plan that will be sent to state and federal authorities. But the pollution reductions won’t be claimed until the winter of 2016-2017 in the plan — a matter of bookkeeping on the way to the 2019 attainment date.
The district board moved the restrictions up two years to get the health benefits early.
Over Thanksgiving, a friend asked how the San Joaquin Valley’s air quality might affect someone with a heart problem. It’s a good question now when the most dangerous air issues arrive.
There is evidence that heart attack risk rises as particle pollution, known as PM-2.5, increases.
What’s PM-2.5? Think soot from wood burning in fireplaces, though it also comes from diesel exhaust, chemicals in the air and microscopic moisture droplets.
By chance, an air-quality activist last week sent me a link to an article in progress on the Journal the American College of Cardiology. It included a section on PM-2.5, saying the odds of a fatal heart attack for nonsmokers rise 22% for each 10 microgram increase in PM-2.5.
The health standard is 35 micrograms per cubic meter of air. On Jan. 1 this year, one Fresno monitor was 70 micrograms higher than that federal standard.
You don’t need to do the math to see that even people without heart or lung problems were suffering through an air crisis at the time.
The article advises anyone with cardiac problems to avoid exposure during episodes of PM-2.5. Last winter, that would have meant avoiding the outdoors for weeks in December and January.
Obviously, the Valley has many violations of the federal PM-2.5 standard. The biggest hot spots seem to be Fresno and Bakersfield, but there are PM-2.5 violations in many places.
What about this year?
A quick look at the California Air Resources Board site tells us that PM-2.5 hasn’t been a problem yet. If we have a lot of stormy weather this year, we might not have a long run of bad days as we did last year.
If you’re interested in finding out about the air quality in your area, click on this air district page and look for the closest monitor.
This is a tough time of year for people with sensitive lungs. The particle pollution — think of microscopic soot, chemicals and other debris — seems to get a little worst toward the middle of the day. If ozone is the problem in your area today, look for it to spike in the afternoons.
Let’s hope a little breeze blows some of this stuff out as the weather cools in the next few days.