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7 pc of daily deaths in Indian cities linked to PM2.5 levels

Indian air quality standards prescribe 60 micrograms per cubic metre of PM2.5 over a 24-hour period.

News Arena Network - New Delhi - UPDATED: July 3, 2024, 08:26 PM - 6 mins read

Around 7 pc of daily deaths in Indian cities linked to PM2.5 levels: Study

7 pc of daily deaths in Indian cities linked to PM2.5 levels

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On average, 7.2 per cent of all daily deaths in 10 of the largest and most polluted cities in India, including Delhi, Bengaluru and Mumbai, were linked to PM2.5 levels higher than World Health Organization (WHO) guidelines for safe exposure, according to a study published in The Lancet Planetary Health journal.

 

Delhi was found to have the largest fraction of daily and yearly deaths attributable to PM2.5 air pollution, caused by particles sized 2.5 micrometres or less in diameter.

 

Sources of such pollution include vehicular and industrial emissions.

 

Researchers said that daily exposure to PM2.5 pollution in Indian cities is linked with a higher risk of death, and locally created pollution could be possibly causing these deaths.

 

The international team included researchers from Varanasi’s Banaras Hindu University and the Centre for Chronic Disease Control, New Delhi.

 

They found that an increase of 10 micrograms per cubic metre in the average of fine particulate matter (PM2.5) pollution measured over two days (short-term exposure) was related to 1.4 per cent higher daily mortality.

 

The death risk was found to be doubled (2.7 per cent) per a 10 microgram per cubic metre increase, when the researchers restricted their analysis to observations below Indian standards of air quality, less stringent than WHO guidelines for safe exposure, which prescribe 15 micrograms per cubic metre of PM2.5 over a 24-hour period.

 

Indian air quality standards prescribe 60 micrograms per cubic metre of PM2.5 over a 24-hour period.

 

City-wise, the authors found a 0.31 per cent rise in daily mortality per a 10 micrograms per cubic metre increase in PM2.5 in Delhi, while in Bengaluru, the rise was 3.06 per cent.

 

The links between daily exposure to PM2.5 pollution and locally created pollutants were found to be stronger in models which the researchers used to explore cause-and-effect relationships.

 

Therefore, it was possible that the locally generated pollutants were causing these excess deaths, the authors said.

 

“The causal effects were especially strong in cities with lower concentrations of air pollution, such as (Bengaluru), Chennai, and Shimla,” the authors wrote.

 

The study, “the first multi-city, time series analysis of short-term exposure to PM2.5 and daily mortality in India,” looked at roughly 36 lakh daily deaths across ten Indian cities between 2008 and 2019. Other cities included in the analysis were Ahmedabad, Hyderabad, Kolkata, Pune, Shimla and Varanasi.

 

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