The air quality index explained: What air quality is bad?

Purple Air AQI Display

SOLVED: Daily air quality is measured by the air quality index (AQU) reported by the Environmental Protection Agency: This index reports the pollution level and what associated health effects might be concern The index Is calculated for five major air pollutants regulated by the Clean Air Act and takes values from 0 to 300 where a higher valle indicates lower air quality: AQl was reported for sample of 91 days in 2011 in Durham, NC . The relative frequency histogram below shows the distribution

SOLVED: 1.38 Air quality Daily air quality is measured by the air quality index (AQI) reported by the Environmental Protection Agency. This index reports the pollution level and what associated health effects might be a concern. The index is calculated for five major air pollutants regulated by the Clean Air Act and takes values from 0 to 300, where a higher value indicates lower air quality. AQI was reported for a sample of 91 days in 201 in Durham, NC. The relative frequency histogram below sh