On Wednesday, September 13, 2017 at 8:20:07 PM UTC-4, Jeff Liebermann wrote:

I find it hard that the accumulated smog output from small engines
would be significant, especially when compared to automobiles,
industrial output, and bovine flatulence, but so it is written into
the law.

Not so much chain-saws as two-stroke engines in general.

https://www.edmunds.com/about/press/...delinecom.html

Peter Wieck
Melrose Park, PA