Quote Originally Posted by old_biker View Post
There is an industry that pollutes & EPA so far has refused to step up, the EPA regulates emissions from most vehicles, small engines, lawnmowers chainsaws, however they refuse to regulate the aviation industry, no catalytic converters, still using leaded fuel, no emission testing whatsoever of aircraft, but they are allowed to pollute as much as they want.
Not sure who told you that... it was true 20+ years ago, but a lot of things change in 20 years. First, the main point: https://www3.epa.gov/otaq/regs/nonro.../420r05004.pdf That is US emission standards for aircraft engine. It applies mainly to larger jet engines or commercial craft. Here is the FAA's input on the situation: https://www.faa.gov/news/fact_sheets...m?newsId=14754 Lead free airports by 2018.

The only aircraft not require to undergo inspection and emission certifications are military, experimental, and non-regulated aircraft (ultralights, hot air balloons, UAVs, model airplanes, etc).

Jet A - the most common jet fuel in the world, does not contain any lead additives. Lead does not naturally occur in any significant amount in kerosene, the base of which Jet A

Small planes with gasoline engines are subjected to considerably less regulation on emissions than jets, and AV Gas does contain added lead. BUT, compared to anything like automotive or industrial emissions, small gasoline powered aircraft just don't add up to much. It's a piss in the ocean.