What Is PM2.5? The Tiny Air Pollutants Affecting Millions of Americans
Air pollution is often thought of as something visible—a smoky skyline, vehicle exhaust, or haze hanging over a city. However, some of the most concerning air pollutants are so small that they cannot be seen with the naked eye. Among these pollutants, PM2.5 has become one of the most discussed environmental and public health concerns in the United States. From wildfire smoke and traffic emissions to industrial pollution and indoor air contaminants, PM2.5 affects millions of Americans every day. Understanding what these particles are and why they matter can help people make more informed decisions about protecting their health and improving the quality of the air they breathe.
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