Bike Pollution Mask India

Did Delhi’s Air Pollution Drop 25% in 2019? What The Data Says

In September 2019, the Delhi government and Delhi Chief minister Arvind Kejriwal announced Delhi’s PM2.5 air pollution was down 25% in 2019 over the previous year. Yet there is doubt. expressed skepticism about this claim.     As data-driven nerds, we wanted to let the numbers answer this question. So we dug into the Delhi PM2.5 […]

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Did Beijing’s Air Get Better in 2018?

Analyzing new air quality data, Smart Air found that Beijing’s PM2.5 dropped 14% in 2018 compared to the year before. Despite the improvement, Beijing still averages nearly five times the World Health Organization’s annual limit.   Improvement Came Mostly from Winter Enforcement By breaking down the data month by month, analysis shows that the air quality […]

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Plants Have No Detectable Air Purification Effect

Despite the popular conception that plants are purifiers, plants have no detectable effect on particle or gas pollutants, according to the latest test data from real-world homes.   Belief that plants are effective air purifiers is widespread. Arguably the most frequently cited evidence is the NASA study on plants. It feels scientific, authoritative. This page cites it, this page, this page. […]

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