Last week, the World Health Organization reported that about 8.2 million people die every year from air pollution, and the number is still growing. The most harmful air pollutant to human health is called PM2.5, that is, particles with a diameter less than 2.5 microns. Their existence leads to long-term health problems in the lungs, such as asthma and chronic lung disease. When the PM2.5 per cubic meter exceeds 35.5µg, it will become a health hazard. (passenger/compiler)
In Delhi, India, PM2.5 is 152µg/m3; Delhi is the only city listed by WHO as having a very unhealthy PM2.5 level. Its serious air pollution comes from motorcycles and nearby factories.
In Patna, India, PM2.5 is 149 g/m3; Patna, the second largest city in eastern India, is an important agricultural product trading center. The highly polluted air here partly comes from transportation, power plants and other industries.
In Gualior, India, the PM2.5 is 144 g/m3; Of the top 20 cities with the worst air pollution, 13 belong to India. According to The Times of India, the air pollution here mainly comes from coal-fired power plants, automobile emissions and the use of low-key energy in buildings.
In raipur, the PM2.5 is 134 g/m3; Located in central India, raipur is the fourth most polluted city in India. The main pollution sources in this city come from coal-fired power plants and aluminum and iron manufacturing industries.
Karachi, Pakistan, PM2.5 is 117 g/m3; Vehicles, industrial emissions and rapid urbanization have jointly led Karachi to become the most polluted city in Pakistan.
Peshawar, Pakistan, PM2.5 is 111µg/m3; Peshawar has a population of 3.5 million, and the air pollution here is not only from automobiles and industries, but also from brick kilns in the brick making industry.
In Rawalpindi, Pakistan, PM2.5 is 107 g/m3; Rawalpindi is a twin city of Islamabad, the capital of Pakistan. The serious air pollution here comes from the proliferation of private cars. Rawalpindi just started a large-scale transportation system in 2015, and maybe it will drop out of the top ten in the near future.
Iranian Hora Marbad, PM2.5 is 102 g/m3; Marbad, located in the west of Iran, is the most polluted city in Iran. This is an agricultural center, which is probably one of the root causes of air pollution.
In Ahmedabad, India, PM2.5 is 100 g/m3; The main air pollution in this western Indian city comes from the key construction projects in the city.
In Lucknow, India, the PM2.5 is 96µg/m3; Lucknow, located in northern India, ranks tenth in the most polluted cities. The serious level of air pollution here makes the city be classified as unhealthy.
In contrast, from this perspective, the average value of PM2.5 in Beijing is 56µg/m3; However, other calculation methods may make this value higher.
