According to a survey released on Tuesday by the Swiss company IQAir, which specializes in air quality technologies, 39 of the world's 50 most polluted cities are in India.
- Bhiwadi in Rajasthan and Delhi were named the most polluting cities in India.
- Darbhanga, Asopur, Patna, Ghaziabad, Dharuhera, Chapra, Muzaffarnagar, Greater Noida, Bahadurgarh, and Faridabad were among the other Indian cities on the list.
- The top two most polluted cities in the world were discovered to be Hotan in China and Lahore in Pakistan. Bhiwadi, in Rajasthan, and Delhi came next, with PM 2.5 concentrations of 92.7 and 92.6 micrograms, respectively.
Human health is particularly at risk from particles smaller than 2.5 microns, or roughly a tenth of an inch. These tiny particles could enter the respiratory system far enough to affect lung function.
For PM2.5 concentration to be deemed safe over any given 24-hour period, it must be less than 60 micrograms per cubic meter of air, according to the National Ambient Air Quality Standards. The recommended level is 75 micrograms per cubic meter of air, according to the World Health Organization.
According to the survey, India is one of the eight most air-polluted nations in the world. In 2021, it was in fifth place.
In its 2022 Global Air Quality Report, IQAir noted that India's yearly average PM2.5 level was 53.3 g/m3, which was just marginally lower than the average of 58.1 g/m3 in 2021. "Roughly 60% of the cities in India included in this analysis saw yearly PM2.5 levels of at least seven times higher than the WHO limits."
The 15 least polluted regional cities in South Asia included seven Indian cities: Tarakeswar, Digboi, Aladu, Kattupalli, Polampalle, Kharsawana, and Muttayyapuram.
The Swiss business observed that despite an increase in air quality monitoring in India, there is still no credible and accurate emissions inventory in place to measure the effectiveness of reduction initiatives.
In order to calculate industry reduce emissions, it also highlighted the necessity of a "complete national emission database".