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POLLUTION M EDITIONS BASED ON PM (Particulate Matter): PM is an indicator of air pollution. (...) The main components of PM are sulfates, nitrates, ammonia, sodium chloride, soot, mineral powders and water. (...) Although particles with a diameter of 10 microns or less (≤ PM10) can penetrate and lodge deep within the lungs, there are other particles that are even more harmful to health, which are those with a diameter of 2.5 microns or less. (≤ PM2.5). Generally, air quality measurements are reported as daily or annual mean concentrations of PM10 particles per cubic meter (m3) of air. WHO-PM PARTICLES