English: The United States are battling with unprecedented wildfires, fueled by heatwaves and windy conditions. More than three weeks after the start of the current wildfire episode, the states of Washington, Oregon and California are devastated. According to the US National Interagency Fire Center, there are 102 ongoing large fires in the western US and more than 4.4 million acres have burned so far. The intensity of the fires is producing unheard of amounts of smoke along the West Coast. This visualisation, derived from the data acquired by the Tropomi instrument onboard the Copernicus Sentinel-5P satellite on 10 September 2020, shows the smoke cloud covering Washington State, Oregon and California and large areas over the Pacific Ocean. The approximate total area of the blanket of smoke is 4.5 million km2. The insert shows that smoke from US wildfires has reached Norway, after a journey of about 8,000 km. With a revisit time of one day, the Copernicus Sentinel-5P satellite delivers free and open access data that can be used to monitor air quality worldwide, and this data can feed models that predict the impact of aerosol storms.