Air turning toxic… 3.8 million Indians died over 10 years due to air pollution…

New Delhi. In India, the act of breathing is no longer just a means of staying alive; it is increasingly becoming a cause of death. A significant study by the Karolinska Institute in Sweden has revealed startling figures: between 2009 and 2019, 3.8 million people in India died due to air pollution. The primary cause of these deaths was the concentration of PM 2.5 particles in the air, which far exceeded the national standard of 40 micrograms per cubic meter.

The World Health Organization (WHO) sets a much stricter standard, considering only concentrations of up to 5 micrograms per cubic meter to be safe. If this more rigorous benchmark were applied, the death toll would rise to 16.6 million—accounting for approximately 25 percent of all deaths during the study period. In other words, one in every four deaths could be linked to polluted air.

PM 2.5 refers to extremely fine particles with a diameter of 2.5 micrometers or less. To put this into perspective: most bacteria are at least 5 microns wide, a red blood cell has a diameter of about 6 microns, and a human hair is approximately 70 microns thick.

Thousands of PM 2.5 particles could fit onto the dot of a full stop. These particles are so minuscule that, when inhaled, they can reach the deepest parts of the lungs, enter the bloodstream, and spread throughout the entire body. Research from the Karolinska Institute found that every 10-microgram-per-cubic-meter increase in PM 2.5 levels is associated with an 8.6 percent rise in mortality. This effect was observed across 655 districts in India.

Most concerning is that India’s entire population resides in areas where PM 2.5 levels exceed WHO standards. These particles can travel hundreds of kilometers, meaning that pollution is no longer confined to a single city but instead spreads across vast regions.

Smaller cities are emerging as new hotspots.
Previously, air pollution was primarily considered a problem for large metropolitan areas; however, the situation is shifting. Byrnihat, a small industrial town located on the Assam-Meghalaya border, has now become the most polluted place in India. Its annual PM 2.5 level was recorded at 133.4 micrograms per cubic meter—3.3 times the national standard and even higher than the 104.9 micrograms per cubic meter recorded in Delhi.

Delhi has also seen a four percent increase compared to its 2024 level of 101. According to reports from the Central Pollution Control Board and IQAir, PM 2.5 levels were recorded at 91.7 in Gurugram, 87.2 in Sri Ganganagar, 84.7 in Faridabad, 83.6 in Greater Noida, and 83.4 micrograms per cubic meter in Muzaffarnagar.

These figures clearly indicate that industrial zones and rapidly urbanizing smaller cities have become new epicenters of the crisis. To bring pollution levels in places like Byrnihat down to a safe range, a 70 percent reduction is required. This shift demonstrates that the pollution crisis is no longer limited to major metropolitan cities. The Growing Burden of Winter in Metropolitan Cities
According to a report by the Centre for Science and Environment, PM 2.5 levels worsened across major metropolitan cities—Delhi, Mumbai, Kolkata, Bengaluru, Hyderabad, and Chennai—during the 2024-25 winter season. Delhi emerged as the most polluted city, followed by Kolkata. Delhi’s air becomes the most toxic due to its location in the Indo-Gangetic Plain and specific seasonal conditions. However, even in cities previously considered to have better natural ventilation—such as Mumbai, Chennai, Hyderabad, and Bengaluru—average pollution levels have risen.

A four-year study by Respirer Living Sciences found that PM 10 levels in 11 metropolitan cities consistently remained above the national standard of 60 micrograms per cubic meter. In Delhi’s Anand Vihar, PM 10 levels reached 313.8, while in Patna’s Samanpura, they hit 237.7. Not a single city met safety standards throughout the four-year period. Experts point out that this is not merely occasional pollution, but a year-round, persistent exposure, leaving urban populations in contact with hazardous particulate matter for extended periods.

These figures are more than just numbers; they represent a heavy burden on the health of millions. Respiratory illnesses, cardiovascular problems, and premature deaths are on the rise. Pollution is now spreading with equal intensity into smaller cities and industrial zones—areas often overlooked in national discourse are now among the most severely affected. The root of the problem lies in constant sources of emissions, whether from vehicles, industries, or other human activities.

The research serves as a clear warning: without concrete, long-term measures, this crisis will only deepen. Coordinated efforts at all levels are essential to improve air quality and make breathing safe once again.