File:Carbon Monoxide generated by the US wildfires reaches Europe.jpg

English: Extreme weather has battered the Western United States in September 2020, with multiple and out-of-control fires raging along the Pacific Coast. US states most affected were California and Oregon. In California, more than 1.47 million ha have burned so far and three of the state’s four largest wildfires on record have occurred between August and September 2020. In Oregon, the 2020 wildfire season is one of the most destructive on record as more than 400,000 ha of land have burned and hundreds of homes have been destroyed. The intensity of the fires produced unheard of amounts of smoke along the West Coast and released massive amount of pollutants such as PM10, PM2.5, Carbon Monoxide (CO), etc. in the atmosphere, and severely worsened the air quality of the affected areas. The amount of CO emitted during the fires was such that in 15 days it has reached Europe. This image, based on data acquired by the Copernicus Sentinel-5P satellite on 24 September, shows the atmospheric CO over Europe. Carbon monoxide (CO) is an important atmospheric pollutants which affects air quality. Detailed and continuous observations of CO are necessary to better assess its impact on climate and atmospheric pollution. The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5P satellite allows to measureme CO levels with an unprecedented level of detail on a global scale, with a revisit time of one day.