Particulate matter (PM) are inhalable and respirable particles composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust and water. fine particles less than 2.5 microns (PM2.5) pose the greatest risks to health, as they are capable of penetrating peoples’ lungs and entering their bloodstream. Sources of PM include combustion engines (both diesel and petrol), solid-fuel (coal, lignite, heavy oil and biomass) combustion for energy production in households and industry, as well as other industrial activities (building, mining, manufacture of cement, ceramic and bricks, and smelting).
Particulate matter 2.5
35 - 15 µg/Nm3 (ppm)
24 hour - Annual
|Time –weighted average||Averaging Time||Number of allowable exceedances|
|35 µg/m3||24-hour||24 times per annum|
24 times per annum4 - N/A