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This NASA Earth Observatory image released on August 7, 2021 shows smoke emitted from hundreds of forest fires covering most of Russia on August 6, 2021. This true-color image, which was acquired by Moderate Resolution Imaging Spectroradiometer (MODIS) on board NASA's Aqua satellite on August 6, was created using data from four passes of the satellite over the region. The smoke, which was so thick that most of the land below was obscured from view, stretches about 2,000 miles (3,200 km) from east to west and 2,500 miles (4,000 km) from south to north?but it captures only a small part of the smoke from the Russian fires. This week, wildfire smoke has travelled more than 3,000 km (1,864 mi) from Yakutia to reach the North Pole (Photo by Handout / NASA Earth Observatory / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS