Air Quality Service
Air quality is determined by atmospheric aerosols and trace gases, which have adverse effects on, e.g., health, visibility and climate. In particular, the near-surface concentrations of NO2, SO2, O3, NH3, Volatile Organic Compounds (VOCs) and aerosol properties, for air quality purposes often expressed as PM2.5 or PM10, are important. The vertical column densities (VCDs) of trace gases and the column-integrated aerosol extinction coefficients (i.e., the aerosol optical depth, or AOD) can be determined from satellite observations, using the same method globally. In this regard, we are providing analytical studies to monitor these gases and their impacts on our environment.