The United States Environmental Protection Agency (EPA) has developed an Air Quality Index that is used to report air quality. This AQI is divided into six categories indicating increasing levels of health concern. An AQI value over 300 represents hazardous air quality and below 50 the air quality is good.[10]Air Quality Index (AQI) Values Levels of Health Concern Colors
The AQI is based on the five "criteria" pollutants regulated under the Clean Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The EPA has established National Ambient Air Quality Standards (NAAQS) for each of these pollutants in order to protect public health. An AQI value of 100 generally corresponds to the level of the NAAQS for the pollutant.[10] The Clean Air Act (USA) (1990) requires EPA to review its National Ambient Air Quality Standards every five years to reflect evolving health effects information. The Air Quality Index is adjusted periodically to reflect these changes.
මම උගේ උත්තරේ එනකන් හිටියේ. මී හරකට නාගන්න වෙනබව තේරිලා හිමිට මාරු වෙලා.
අපේ උන්ට ගමකට ගහන්න කටවල් නම් තිබ්බට ඉංග්රීසි පොඩ්ඩක් කියවගන්න බැහැනේ...
