Air pollution
Water pollution
Soil pollution
Sound pollution
300 cm
Below 100 cm
100-250 cm
Above 250 cm
Himalayas
Swampy
Rain of Kutch
Malabar region
Savannahs
Kerala
Nilgiris
Pascal
Decibel
Ampere
Light year
Hygrophilious
Mesophilous
Xerophytes
Halophytes
Treatment of sewage
Treatment of industrial wastes
Vermitech
Biotech
Lichen
Leech
Sea animone
Hermit crab
Increase in co2 concentration
Increase in O2 concentration
Increase in NO2 concentration
Increase in SO2 concentration
D2O
HNO2
H2O2
H2O