Wildfires are ravaging the Arctic, with areas of northern Siberia, northern Scandinavia, Alaska and Greenland engulfed in flames. There are hundreds of fires covering mostly uninhabited regions. But smoke is affecting wider surrounding areas, engulfing some places completely. Cities in eastern Russia have noted a significant decrease in air quality since the fires started.
Mark Parrington, a wildfires expert at the Copernicus Atmosphere Monitoring Service (Cams), described them as "unprecedented".