Q.Bhopal Gas Tragedy is a case of _____________

Atmospheric pollution is studied separately for the two atmospheric layers where humans and the ozone shield exist. The troposphere is the lowest ~10 km layer, turbulent and rich in water vapour, where humans and other organisms live and breathe; pollution here directly affects health, plants and materials. The stratosphere lies roughly 10-50 km up and contains the ozone layer, which absorbs about 99.5% of the sun's harmful ultraviolet radiation, protecting life on earth. Because the two layers have very different compositions and roles, atmospheric pollution is split into tropospheric pollution (gaseous and particulate pollutants near the ground) and stratospheric pollution (chemical depletion of the protective ozone layer), each with distinct causes, chemistry and consequences.