What types of pollutants are being monitored worldwide?

Six main air pollutants are monitored in most countries: ozone (O3), fine particulate matter (PM2.5), particulate matter (PM10), nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO).

Although there are hundreds of harmful pollutants out there, these six pollutants have been selected for several reasons, including: their significant presence in the ambient environment, the ability to measure them effectively and accurately, and their proven impact on human health, at least in the short-term.


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