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What is PM2.5 (Particulate Matter 2.5)?
PM is a common proxy indicator for air pollution. It affects more people than any other pollutant. There is a close, quantitative relationship between exposure to high concentrations of small particulates (PM10 and PM2.5) and increased mortality or morbidity, both daily and over time.
Individuals with chronic conditions (such as asthma and heart disease), older people, children and pregnant women, may be particularly sensitive to PM2.5.
According to WHO guidelines: PM2.5 should not exceed 5 μg/m3, while 24-hour average exposures should not exceed 15 μg/m3.