PM2.5 is one of the more commonly used terms when discussing air pollution.
PM stands for Particulate Matter, and the 2.5 refers to the size of the particles.
Particulate matter is a type of air pollutant that consists of tiny solid particles and liquid droplets suspended in air.
PM2.5 specifically refers to particles with a diameter of 2.5 micrometers or less, which are small enough to be easily breathed in and absorbed into the lungs.
They are the most dangerous type of air pollutants as they can penetrate deep into the lungs and even enter the bloodstream.
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