Particulate matter (PM) 2.5 is a group of airborne particles smaller than 2.5 micrometres found in ash, dust, vehicle exhaust, smoke, and sometimes the air we breathe. A micrometre is roughly one-millionth of a metre—about 30 times smaller than the average diameter of a human hair—and is only visible with[Read More…]
Tag: world health organization
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March 30, 2024