IQAir News

smog coming out of factory exhaust pipes

How does the Live Major Cities Ranking work?

The Major Cities Ranking is meant to provide a worldwide context about air quality. Learn more.

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IQAir Air Quality Map

How wind and weather affect air pollution

Wind and weather can play a crucial role in influencing a region’s air quality. Learn more.

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IQAir Air Quality Map

How wind and weather affect air pollution

Wind and weather can play a crucial role in influencing a region’s air quality. Learn more.

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Factory exhaust

Carbon monoxide

Carbon monoxide is an odorless, colorless gas produced by the incomplete combustion of fossil fuels (wood, oil, gas, or coal).

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Hazy skies over city landscape

PM2.5

Particulate Matter (PM) are particles measuring 2.5 microns or less. Learn more.

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Heat map of the world

What determines ‘major cities ranking’?

The Major Cities Ranking is meant to provide a worldwide context about air quality. Learn more.

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Man in city coughing with face mask

What pollutants should I watch out for?

A list of the different air pollutants and their sources.

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Man in city coughing with face mask

What pollutants should I watch out for?

A list of the different air pollutants and their sources.

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Co2 sensor in home

Indoor carbon dioxide

Learn about indoor CO2, including when indoor CO2 is too high and how to monitor it.

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