The number of days of high pollution in Mashhad over the past eight months has increased by close to 20 percent compared to the same period last year.

ILNA reports that the head of urban development in Khorasan Razavi province announced this week that temperature inversion has been pushing up the level of air pollution in recent months.

He stressed that the Mashhad air pollution task force was charged with a series of responsibilities during this time, and reports on its activities must be submitted within 24 hours.