Today, I find those claims more than likely to be true. Dr. Pohl cites the recent requirement by the Environmental Protection Agency for cities with high concentrations of ozone in their atmosphere to warn citizens, especially those with chronic respiratory problems. It reacts with lung tissue to inflame and cause harmful changes in air passages, decreasing lung efficiency.
Ozone is just one problem.
In addition, there are more things floating around in the air, from dust particles to plant pollen and mold spores. The answer to these questions, he says, is no. Being inside at times creates a new set of problems with indoor air. When an old dirty carpet is in a house it can be a source of particulate matter that can worsen breathing problems. Deodorant sprays, air cleaners, room deodorizers, hair spray, or anything else that creates particulate matter could be a bother to those susceptible.