Tehran's air quality index entered the purple range with a mixture of particulate pollutants PM 2.5, PM 10 and NO2 at 6:00 PM tonight at some stations, a situation considered disastrous for all groups.
Tehran has become the second most polluted city in the world; Pollution index in unhealthy range.
According to data from the international air quality monitoring website, iQwire, on Sunday, November 15, Tehran was ranked second in the world's most polluted major cities and in the "unhealthy range" with an air pollution index of 193.