This map, which is based on data from NASA’s satellite-based Ozone Monitoring Instrument, illustrates elevated levels of nitrogen dioxide over several cities across southwestern Asia and the Middle East from Jan. 1-8. Shades of orange reflect the relative abundance of NO2 in the atmosphere, with high levels visible in Tehran, Istanbul, and New Delhi. Areas shown in grey indicate areas where data was insufficient. (NASA)

via Map Illustrates Air Pollution Across Asia, Middle East: e360 Gallery.