I didn't claim it's happening now. The state legislature of California did: "The Legislature finds and declares all of the following..." I don't know for sure that the legislators who drafted this law verified that the predictions from several years ago have held up based on newer data, but it's really not much of a stretch think that they actually did check with the experts.

As for airplanes, power plants and other large-scale users of fossil fuels: like cars and unlike gas-powered lawn tools, they tend to more carefully manage combustion to burn cleaner, and power plants can treat exhaust (like cars do with catalytic converters). So those sources are cleaner per gallon of fuel than a gas-powered leaf blower, and they don't exhaust quite as close to living, breathing people.

Ah, I see that you responded with a source on behalf of the person making the claim. Although my sentiment still stands - the source doesn't support the claim.

"So those sources are cleaner per gallon of fuel than a gas-powered leaf blower, and they don't exhaust quite as close to living, breathing people."

Per gallon. Lawn equipment is is a tiny fraction compared to these others. Airports tend to be in cities, power plants tend to be close to population centers, most people have a road in front of their house... sounds like those are close to people, output more overall, and are used more frequently than once every week or two.

> Although my sentiment still stands - the source doesn't support the claim.

It does. If you don't believe the source, then take that up with CARB. But don't act like information provided by a government regulator is hearsay.

The California government has a track record of declaring “facts” like this to push their agenda. The fact that a government agent claimed something does not automatically make it true.

Can you show me where CARB says it's currently happening? You only posted a link to and quote about a prediction made in 2017.