The study shows that a lockdown can, for example, reduce air pollution from traffic and industry but at the same time increase pollution from residential sources such as heating.

COVID-19 lockdowns only reduced air pollution in some parts of the world

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When COVID-19 lockdown measures were first introduced last year, schools and shops closed, tourist spots were deserted due to international travel restrictions, and economies slowed down as most people adjusted to life in the confines of their home.

Globally, these measures reduced air pollution by 45 per cent domestically and 35 per cent internationally on average during the first wave of lockdowns. These are the findings of a recent study assessing the global environmental impacts of the initial COVID-19 lockdowns….

https://news.ubc.ca/2021/04/06/covid-19-lockdowns-only-reduced-air-pollution-in-some-parts-of-the-world/

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