Laboratory of Climatology and Atmospheric Environment, Sector of
Geography and Climatology, Department of Geology and Environment, National
and Kapodistrian University of Athens, Athens 15784, Greece
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing,
National Observatory of Athens (IAASARS/NOA), Athens 15236, Greece
Department of Physics, ETH Zurich, Zurich 8093, Switzerland
Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC), Davos 7260, Switzerland
Laboratory of Climatology and Atmospheric Environment, Sector of
Geography and Climatology, Department of Geology and Environment, National
and Kapodistrian University of Athens, Athens 15784, Greece
Megacities' air quality is determined by atmospheric aerosols. We focus on changes over the last two decades in the 81 largest cities, using satellite data. European and American cities have lower aerosol compared to African and Asian cities. For European, North American and East Asian cities, aerosols are decreasing over time, especially in China and the US. In the remaining cities, aerosol loads are increasing, particularly in India.
Megacities' air quality is determined by atmospheric aerosols. We focus on changes over the last...