Air quality index is used by government agencies to communicate to the public how polluted the air is. Public health risks increase as the AQI rises. Eight pollutants namely particulate matter PM10, ...

We want to hear from you: What should Alaska's highest mountain be named and why does it matter to you? Or maybe it doesn't matter to you. We'd still like to hear your thoughts on the subject.

Patna: Rajgir, with a ‘very poor' air quality index (AQI) of 313, was the most polluted city in the country on Friday. State capital Patna's AQI was 252 in the ‘poor' category. The major ...