Shanghai, Moscow and Tehran have the highest levels of NO2 pollution, according to the research

Cities in relatively prosperous countries are blighted by serious levels of air pollution from nitrogen dioxide, often without realising the extent of the problem, research has found.

Moscow is the world’s second worst city for nitrogen dioxide pollution, behind Shanghai in China, while St Petersburg takes fourth place. Other cities near Russia follow close behind, including Ashgabat, capital of Turkmenistan, and Minsk, capital of Belarus, at seventh and eighth place respectively, according to the research, published on Wednesday.

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