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No. Particulate matter (PM) is a term that encompasses a wide range of pollutants. PM in the air we breathe can come about from many sources, including blowing dust, smoke from wildfires, and industrial pollution.
In the past 5 years, we have had 5 days where 8-hour averages of ozone have reached the EPA category known as "Unhealthy for Sensitive Groups." Thus our ozone problem is nowhere near the magnitude of many East Coast or California cities. On the other hand, as our population grows and more vehicles are on the road, ozone levels will inevitably increase. Ozone is a serious health concern for asthmatics and others with respiratory issues.
No. Ozone is only a concern during the warm season. During the cool season, our sun angle is lower than in the warm season. Sunlight drives the chemical reactions that result in the formation of ozone. Thus the greater intensity sunlight of summertime results in greater concentrations of ozone.
"Your chances of being affected by ozone increase the longer you are active outdoors and the more strenuous the activity you engage in. If you're involved in an activity that requires heavy exertion, you can reduce the time you spend on this activity or substitute another activity that requires less exertion. You could plan outdoor activities when ozone levels are lower, usually in the morning or evening." (U.S. EPA)