If you have been hearing about poor air quality in New York City Friday, you can breathe a deep sigh of relief (literally): ...
Learn what the air quality index (AQI) means, how it impacts your health, and how to stay safe when pollution is high.
But as the fires burned through houses, cars and industrial areas, they spewed out vast amounts of smoke, ash and noxious ...
The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) ...