Compare AQI level of any four cities for regular days. Find the ratio of greatest and smallest and convert it into percentage.
Answers
After Diwali, Delhi's air quality got worse as the air quality index (AQI) dipped from 'very poor' to 'severe.' But it turns out, Delhi is not the most polluted city after all.
In the past 72 hours, Kolkata surpassed Delhi in becoming the most polluted metropolitan city.
The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health .Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country.