I recall reading an article concerning this point..
Locale was East coast, ( Wash, Atlanta, Richmond ? ) and the complaint was "that oxygen".
It was Ozone...
Ozone created at ground level is a pollutant..
It readily combines with.. everything.. especially exhaust fumes from industry, vehicles, etc..
The people in the area wanted to cut down the forest..
You just can't win..
Oxygen is O2. Ozone is O3. Ozone oxidizes almost everything. It does not last long in the free state.