Tehran’s Air Quality ‘Good’ Only on 9 Days of Last Year

Air Quality Index was “good” on only nine days from May 22, 2022, to May 21, 2023, charts published by Tehran Air Quality Control Company’s website, Airnow.tehran.ir, show. 
The company said 200 days turned out to be moderate, 122 days remained unhealthy for sensitive groups, 31 days stayed unhealthy, two days were very unhealthy and one day was hazardous.
The index categorizes air conditions according to a measure of polluting matters into good (0-50), moderate (51-100), unhealthy for sensitive groups (101-150), unhealthy (151-200), very unhealthy (201-300) and hazardous (301-500).
TAQCC indicates that AQI hit “good” quality on two days in the second month of the current fiscal year (April 21-May 21).
Statistics show that the “moderate” status was recorded on 27 days, as AQI hovered between 51 and 100 during the period.