Below are links to various studies, scientific papers and newspaper articles that present different perspectives about ozone issues.
Lawnmowers pollute as much as 11 cars! 5-19-08
This report was published last year, but I just found out about the info this past weekend.
According to the EPA, Americans spend more than three billion hours per year using lawn and garden equipment. Currently, a push mower emits as much hourly pollution as 11 cars and a riding mower emits as much as 34 cars.