PM 10 and PM 2.5 refer to particulate matter of specific sizes that are commonly used to measure air pollution. They are classifications based on the aerodynamic diameter of the particles.

 PM 10 and PM 2.5 are measured in micrograms per cubic meter (µg/m³) and are used as indicators of air quality. High levels of PM 10 and PM 2.5 in the atmosphere can have adverse effects on human health, particularly respiratory and cardiovascular systems. Prolonged exposure to elevated levels of these particles has been linked to respiratory diseases, asthma, bronchitis, lung cancer, and cardiovascular problems. Monitoring and controlling PM 10 and PM 2.5 levels are important for assessing air quality and implementing measures to reduce pollution and protect public health.