Researchers are exposing troubling consequences of air pollution Breathing clean air is important for everyone's health, but some communities face more risks than others

https://magazine.medlineplus.gov/article/researchers-are-exposing-troubling-consequences-of-air-pollution?utm_medium=email&utm_source=govdelivery The air we breathe can sometimes contain tiny particles called particulate matter (PM). These particles come in different shapes and sizes and are made up of hundreds of different chemicals. Some are very small, smaller than 2.5 micrometers. They are referred to as PM2.5. You can't see these particles, but you can inhale them. As a group, PM2.5 is responsible for most pollution-related health problems in the United States.