According to the Air Quality Control Company, none of Tehran’s monitoring stations recorded air in the acceptable range, and 20 stations registered red-category readings, indicating unhealthy conditions for all residents.
Stations across districts in Tehran showed elevated PM2.5 concentrations and red-level pollution.
Environmental officials say that similar air quality deterioration has been recorded in other major cities, including Isfahan, Karaj, Qom, and Mashhad, due to stagnant weather patterns and increased particulate emissions.
AQI levels between 151 and 200 are considered unhealthy for all groups, while readings above 200 are categorized as very unhealthy or hazardous.
