Tehran Air Quality Worsens

Although a large number of people stayed home in self-quarantine as the novel coronavirus rampaged across Iran, official data show Tehran’s residents were exposed to more polluted air in March compared to the year-ago month.
Charts published by Tehran Air Quality Control Company website, Airnow.tehran.ir, show that clear blue skies were seen only for eight days in the month, meaning that the air quality index was under 50.
The index categorizes conditions dictated by 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).