Air pollution over northern Italy fell after the government introduced a nationwide lockdown to combat coronavirus, satellite imagery showed on Friday, in a new example of the pandemic's potential impact on emissions. China, where the outbreak started, showed a marked reduction in pollution after the government imposed travel bans and quarantines, and the data from Italy, which was hit hard several weeks later, suggested a similar pattern. The European Space Agency (ESA) said it had observed a particularly marked decline in emissions of nitrogen dioxide, a noxious gas emitted by power plants, cars and factories, over the Po Valley region in northern Italy.
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