US Air Quality Index: Lahore is world’s most polluted city

Lahore, the cultural capital Pakistan, has been ranked as the world’s most polluted city, according to air pollution data released by the US Air Quality Index (AQI). Lahore reported a particulate matter (PM) rating of 423. New Delhi stood second with a PM of 229, while Nepal’s capital Kathmandu ranked the third with a PM of 178.

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About AQI:

• The Air Quality Index (AQI) is released by the US Environmental Protection Agency (EPA) to give people an idea of whether it’s safe to breathe the air.
• AQI is based on the levels of five major pollutants regulated by the EPA: ground-level ozone, particulate matter (PM2.5), carbon monoxide, sulfur dioxide, and nitrogen dioxide.
• AQI measures air quality by placing it on a scale of 0-500, where air quality is regarded as satisfactory if the AQI is under 50.

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