Air Quality Index (AQI) is the main index that shows how clean or polluted the air in your area is. It measures the major air pollutants: ground-level ozone, particle pollution, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The index is measured on the scale of 0 to 500, where 0 to 50 AQI is considered good air quality and it means there is little or no health risk in the air, and 300 to 500 AQI is hazardous, which means that it's very dangerous. Lire la suite