The Sacramento region's air quality reached "unhealthy for sensitive groups" level on Thursday morning, according to IQAir.

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 ...

Data updated at 8:30 am on January 17 showed the overall AQI in Mumbai at 210, classified as Severe under the US AQI scale.

Mumbai’s air quality deteriorated sharply on Thursday morning, with the city’s overall Air Quality Index (AQI) entering the ...