Volunteers track Parisian pollution with the help of tree bark

Along the streets of Paris, more than 40,000 tall, leafy plane trees provide picturesque backdrops, offer shade to city dwellers, and improve air quality, among numerous other benefits. Since 2016, some of these trees have ...

Air pollution falls after London vehicle curbs: Mayor

London's Mayor Sadiq Khan on Thursday claimed success for his expanded pollution toll zone for motor vehicles, pointing to a drop in levels of a harmful air pollutant since its controversial introduction.

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