pollution has, perhaps surprisingly, increased. These images measure level of nitrogen dioxide in the atmosphere, an important indicator of air quality. They show changes in nitrogen dioxide ...

Striking before-and-after photos released by NASA and other agencies reveal significant reductions in air pollution over different metropolitan areas. Nitrogen dioxide pollution, emitted by motor ...

One cartoon portrays the mayor in front of a rising graph with the speech bubble: "And this clearly shows air pollution is going down." Another sketch drew inspiration from Boris Johnson's remarks ...

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