Add Yahoo as a preferred source to see more of our stories on Google. The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) But many ...

Add Yahoo as a preferred source to see more of our stories on Google. Wildfires in Canada are sending heavy smoke across the northern U.S., and New Jersey is experiencing some unhealthy air pollution.

Delhi’s air debate is dominated by numbers—daily AQI values, PM2.5 averages, counts of “good”, “poor”, and “severe” days.

Dhaka, Feb. 3 -- Dhaka, the densely populated capital of Bangladesh, ranked fist among the world's most polluted cities on Tuesday morning, recording an Air Quality Index (AQI) of 275 at 11:19 am.

After fires destroyed multiple neighborhoods across Los Angeles County, many residents looked up to find blue, smoke-free skies this week. The Air Quality Index (AQI) — which measures the ...

Wildfires in Canada are sending heavy smoke across the northern U.S., and New Jersey is experiencing some unhealthy air pollution. The air quality has some Northeasterners wondering, what is the AQI, ...