Change in air quality index and rush-hour traffic congestion before and after lockdowns in selected cities, 2019 compared to April 2020

IEA, Change in air quality index and rush-hour traffic congestion before and after lockdowns in selected cities, 2019 compared to April 2020, IEA, Paris https://www.iea.org/data-and-statistics/charts/change-in-air-quality-index-and-rush-hour-traffic-congestion-before-and-after-lockdowns-in-selected-cities-2019-compared-to-april-2020, IEA. Licence: CC BY 4.0

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