tehran schools and government offices closed in irans capital and several other cities in the country on monday after yet another sandstorm blanketed tehran and the surrounding regionstaterun tv warned of poor air quality and advised the elderly those sick and children to take precautions banks and the tehran stock exchange would remain open the report saidthis is the second time that tehran shuttered schools and government offices and the fourth bad sandstorm since midapril schools and government offices in tehran were closed for the first time on account of a sandstorm in may however the countrys west along the border with iraq has seen frequent closures of schools and offices due to sandstormstehran is among the most polluted cities in the world experts blame poor government policies desertification and low water levels as well as climate change for the frequency and intensity of recent sandstorms