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The graphs show the evolution of atmospheric NO<sub>2</sub> pollution in ten European cities between weeks 11 and 27 in 2019 and 2020. In most cases, there was a significant reduction in micrograms per cubic metre (μg / m<sup>3</sup>), which was especially remarkable in cities such as Paris (weeks 13 and 16), Milan/Milano (week 13) and Madrid (week 15).
