The World Health Organization (WHO) has stated that India is home to four of the five cities in the world with the worst air pollution and many countries are so bad that they have no monitoring system and cannot be included in its ranking.
As per the ranking the dirtiest air was recorded at Zabol in Iran, which suffers from months of dust storms in the summer, and which clocked a so-called PM2.5 measure of 217 and the next four were all Indian places like Gwalior, Allahabad, Patna and Raipur.
The common causes of air pollution include too many cars, especially diesel fuelled vehicles, the heating and cooling of big buildings, waste management, agriculture and the use of coal or diesel generators for power and the pollution levels have worsened by 8% between 2008 and 2013.
Maria Neira, head of public health, environmental and social determinants of health at the WHO has told that WHO database has almost doubled in size since 2014, and the trend towards more transparency translated into more action to deal with the problem.
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