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What Does PM2 5 Mean?

January 24, 2024 by Jasmine Sibley

What Does PM2 5 Mean? Fine particulate matter is defined as particles that are 2.5 microns or less in diameter (PM2. 5). What does PM 2.5 mean in air quality? The term fine particles, or particulate matter 2.5 (PM2.5), refers to tiny particles or droplets in the air that are two and one half microns

What Level Of PM2 5 Is Unhealthy?

January 24, 2024 by Sophia Kim

What Level Of PM2 5 Is Unhealthy? AQI Category Index Values Revised Breakpoints (μg/m3, 24-hour average) Unhealthy for Sensitive Groups 101 – 150 35.5 – 55.4 Unhealthy151 – 200 55.5 – 150.4 Very Unhealthy 201 – 300 150.5 – 250.4 Hazardous 301 – 400 250.5 – 350.4 Is PM 2.5 really dangerous? Fine particles (PM2.5)