According to Borna; From the beginning of autumn until now, the citizens of Tehran have been breathing 53 days of acceptable air and 37 days of unhealthy air for sensitive groups (due to the increase in the concentration of suspended particles less than 2.5 microns). The air in Tehran was polluted for 37 days during the fall, among which the share of air pollution in December was reported to be 19 days, and December was the most polluted month of autumn this year.
In the fall of 1998, Tehran had 58 days of acceptable weather and 32 days of polluted air, of which the share of unhealthy air for sensitive groups was 29 days and the share of unhealthy air for all was three days.
Map comparing air pollution this year and similar days last year
Also, according to the Tehran Air Quality Control Company, Aseman Paytakht has experienced 15 days of clean air, 185 days of healthy air, 73 days of unhealthy air for sensitive groups and 2 unhealthy days for all age groups since the beginning of this year.
According to this report, the most important cause of air pollution in the cold months of the year is an increase in the concentration of particulate matter less than 2.5 microns. According to the latest publication list of Tehran, the share of moving sources such as taxis, private cars, buses, etc. in the production of particulate matter is 60%, among which diesel cars have the most important role. Suspended particles are one of the most dangerous pollutants in the air and can aggravate heart and lung disease and cause heart attacks and asthma in the long run.