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POLLUTION, Contamination of air by harmful substances like poisonous gases…

- - - - Volcanic eruption
      - Earthquake
      - Cyclones and dust storms
      - Forest fires
      - Microbes in air
    - - Burning solid waste
      - Industrialization
      - Fuel
      - Atomic plants and bl asts
  - - - Respiratory diseases
      - Irritation of eyes
      - Pois oning, skin cancer
    - - Stomata gets closed
      - Slow rate of photosynthesis
      - Retarded growth
- - - - Aquatic weeds
      - Sludge
      - Soil erosion
      - Nematodes
    - - Domestic sewage
      - Oil spillage
      - Industrial effluent
      - Ashes disposal
      - Use of fertilizers and pesticides
  - - - Diseases-Hepatitis, typhoid, skin diseases
      - Ailments of liver, kidney, brain and hypertension
    - - Retarded plant growth
      - Death of aquatic animals
      - Loss of plant species