Air quality conditions across several U.S. cities reached levels this week that federal agencies deem "unhealthy for sensitive groups," prompting health alerts and recommendations that children and ...

What is AQI Index: The Air Quality Index (AQI) is used by government agencies to measure the quality of air. AQI measure all the details from air quality sensor which increases due to pollution such ...

Air quality varies based on the type of pollutants in the cycle and can have dramatic ramifications for those breathing ...

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.

A fast-moving wildfire continues burning in New Jersey's Pine Barrens as of Wednesday afternoon -- already consuming 12,000 acres and only being 35% contained, according to officials. For Wednesday, ...

As winter sets in, a thick layer of smog enveloped the national capital Delhi on Wednesday morning. The city's air quality remains in the 'Very Poor' category, with an AQI of 376 at 7 am, according to ...