Particulate Trend

PM_2.5 is particulate matter less than 2.5 micrometres in diameter that are small enough to penetrate into the lungs. PM₁₀ is particulate matter less than 10 micrometres in diameter that can be inhaled into the nose and throat. A human hair is about 70 micrometres in diameter. Sources of particulates include soil dust, road dust, agricultural dust (e.g., harvest), smoke from forest fires and recreational wood burning, vehicle exhaust emissions, and industrial emissions.

	Particulate Trend PM_2.5 is particulate matter less than 2.5 micrometres in diameter that are small enough to penetrate into the lungs. PM₁₀ is particulate matter less than 10 micrometres in diameter that can be inhaled into the nose and throat. A human hair is about 70 micrometres in diameter. Sources of particulates include soil dust, road dust, agricultural dust (e.g., harvest), smoke from forest fires and recreational wood burning, vehicle exhaust emissions, and industrial emissions.