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1 May 2024

How To Clean Up New Delhi’s Smoggy Air


Nowhere else do people breathe air as dirty as in India. According to the World Health Organisation, as many as 1.3 million deaths per year on the subcontinent can be attributed to polluted air. With its National Clean Air Programme, the Indian government wants to enact countermeasures.

To do this, decision-makers need to know what sources the particulates come from, how they are distributed regionally, and how harmful certain compounds are to human health. This important information has now been provided for the first time by a study led by members of the Laboratory for Atmospheric Chemistry at PSI, with partners from India, China, Germany, Denmark, France, Spain, and Switzerland. The researchers have not only determined the amounts and origins of particulates in the air, but also their oxidative potential – an important factor for the harmful effect a chemical compound can have on living cells and thus on health. The study has now been published in the journal Nature Communications.

The focus of the study was on the Indian capital New Delhi, and not for the first time. Of all the cities on earth, it is considered the metropolis with the highest concentration of particulates in the air. Over the past four years, the researchers had already gained groundbreaking insights into the air pollution there. In a study from 2023, they demonstrated for the first time that chemical processes run differently in the skies over New Delhi than in other major cities.

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