Smog in Tehran is being blamed for 412 deaths in 23 days and has led authorities to close all schools in the city. A new record was reached May when the concentration of airborne particles PM2.5 reached 150. PM2.5 levels are used to calculate the effect of air pollution on health. The particles, measuring under 2.5 micrometres in diameter, can enter the lungs and bloodstream and have been associated with heart disease, bronchitis and lung cancer. In this week, the World Health Organisation ranked the Iranian city of Zabol as the world’s most polluted city in relation to PM2.5.
Smog in Tehran is being blamed for 412 deaths in 23 days and has led authorities to close all schools in the city. A new record was reached this week when the concentration of airborne particles PM2.5 reached 150. PM2.5 levels are used to calculate the effect of air pollution on health. The particles, measuring under 2.5 micrometres in diameter, can enter the lungs and bloodstream and have been associated with heart disease, bronchitis and lung cancer. In May, the World Health Organisation ranked the Iranian city of Zabol as the world’s most polluted city in relation to PM2.5.