Particulate matter is the main unit of measurement for air pollution. There are two types--PM10 and PM2.5--named as such because of the particle's size in microns. These particulate matters are not visible with the naked eye. To give perspective, a grain of fine beach sand has a micron diameter of 90.
While particulate matter concentration contributes to a sunset's dusky orange and pink hue, it also plays a role in a host of other ailments including lung cancer and strokes. Look at the infographic below to learn more about PM10 and PM2.5:
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