While most of us do not have the power to make the air cleaner, there are some ways to protect yourself
Nice article from on reducing exposure to air pollution. Many steps, especially those with the largest impact, require collective action / government action; a few steps can happen at the individual level.
How to Reduce Exposure to Air Pollution - The New York Times
News you can use. I sometimes run in the park (I'm 66 and fighting it), but check air quality first and use an indoor gym when it's bad.
This article on How to Reduce Exposure to Air Pollution illustrates the limits of individual actions. The most effective solutions require community/societal actions, like transitioning to clean energy.