India leads the world in average yearly PM2.5 levels and dominates the worldwide indoor air pollution chart.

Dyson just published the results of the Global Connected Air Quality Data project by analysing indoor air quality information collected using over 2.5 million Dyson air purifiers via the MyDyson app, where, India recorded the highest average annual PM2.5 levels when compared to countries like China, Turkey, UAE, and South Korea. The study reports that, in all the countries, the monthly average indoor PM2.5 levels exceed the WHO long-term exposure guidance for at least six months in a year with winter being the most polluted season in all geographies. In India, the levels exceed the WHO guidance every month of the year. The study also highlights that Delhi is amongst the most affected cities when compared to Beijing, Shanghai, Shenzhen, and Busan. The report also highlighted that, in Delhi, the air inside the home was 15 per cent more polluted than outside air. The study focuses on two different types of pollutants — particulate matter (PM) 2.5 and Volatile organic compounds (VOCs), where, PM 2.5 particles will be as small as 2.5 microns in diameter, which will be invisible to the naked eye and can be inhaled. These particles are usually generated by wood burners, gas cooking, heating, pet dander, ash, and dust. In cities like Delhi, the indoor air gets 48 per cent dirtier in winter, especially during nighttime.

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