The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

Lahore has once again emerged as the most polluted city in the world, registering an average Air Quality Index (AQI) reading of 271, according to the latest global air pollution data. This figure ...

Learn what the air quality index (AQI) means, how it impacts your health, and how to stay safe when pollution is high.

Doctors from National Jewish Health talk about how to know if you’re at risk, and steps you can take to protect your heart ...

Los Angeles residents will have to cope with the effects of smoke-related unhealthy air, the Los Angeles County Health ...

Southern California wildfires have spurred smoke advisories by authorities and contributed to hazardous air quality ...

The Bangladesh Department of Environment, which gives immediate updates on air quality, said that Dhaka’s AQI score was 201 at 11am, which is considered “very unhealthy”. Air quality is ...

An AQI generally features six color-coded categories of air quality — Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy and Hazardous — with more details on the ...

Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.

Air quality for a large portion of Los Angeles County has reached the very unhealthy Air Quality Index (AQI) category due to a cluster of wildfires ravaging the area. The impacted area ...