PM2.5 levels are considered the best measure of the impact of air pollution on health. The new World Health Organisation database of worldwide air pollution measures put the Iranian city of Zabol, on the eastern border with Afghanistan, as the world’s most polluted city, based on PM2.5.

Located in a basin, surrounded by mountains and with little wind to disperse the smog, the geographical location of the city of Tehran does not promote the rapid rise of pollution towards the sky.

Five million cars, many of which are defective, polluting and non-compliant, and locally refined petrol is helping to produce an enormous amount of PM 2.5 in Tehran.

During the winter, cars are driven in the streets in the early morning while the ground is still cold, this causes the hot, polluted air, hot to get trapped beneath the cold air above, causing the phenomenon of climatic inversion.

During autumn and winter, Kindergartens and primary schools in Tehran are ordered to stay closed, and traffic restrictions are tightened. It is highly recommended to not got outside during these days, or to wears a face mask to avoid the worst of the city's pollution if you must go outside

During winter 2016, the capital's Air Quality Index (AQI) was reported once at 156 and declared as “unhealthy” for people of all ages and health conditions.

Those at risk include the elderly, pregnant, children and those with respiratory and heart conditions. In 2012, the Iranian Ministry of Health estimated that pollution had contributed to the premature deaths of 4,500 people in Tehran and about 80,000 across the country.

To check daily pollution in Tehran, check this website:

//aqicn.org/map/iran/#@g/35.742/51.4367/14z">http://aqicn.org/map/iran/#@g/35.742/51.4367/14z

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