America Is Backsliding Toward Its Most Polluted Era

Updated at 11:37 a.m. on April 9, 2025 When you inhale a microscopic speck of soot, its journey may go like this: The particle enters your nose and heads into your lungs, penetrating even the tiny air sacs that facilitate gas exchange. Next it may slip into your bloodstream and flow into your heart, or past the blood-brain barrier. Most of us inhale some of these tiny particles every day. But inhaling enough can turn the act of breathing into an existential hazard, prompting or worsening asthma, COPD, respiratory infections, and permanent lung damage. In the heart, the specks can trigger heart disease, heart attacks, and most of the cardiovascular disorders you can think of. Air pollution is also associated with depression and anxiety, and with higher rates of suicide. It can trigger strokes and is linked to dementia or—even at average levels in this country—Parkinson’s disease. These particles can also cross the placenta, where they can reduce an infant’s lung function before birt ... Read full article.