As the lives of millions of people worldwide were disrupted by social distancing measures to combat the COVID-19 pandemic in early 2020, an unexpected piece of good news surfaced: levels of air pollution in major cities had dropped by up to 50% due to the global reduction in traveling, manufacturing, and construction. The most dramatic effects were seen in India, home to 14 of the 20 most polluted cities on Earth, where people posted photos on social media showing blue skies and clear air for the first time in recent memory.
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Source: Phys.org