1. Photochemical oxidants/O₂ and CO₂
2. SO₂
3. Chlorofluorocarbons
4. Smog

Submitted by :- Muhammad Nawaz

1. CO₂
2. CO
3. O₂
4. N₂

Submitted by :- Muhammad Nawaz

1. Pollen grains
2. Automobiles
3. Industries
4. Hydroelectric power

Submitted by :- Muhammad Nawaz

1. Acid rain
2. Greater exposure of earth to U.V. rays
3. Increased amount of CO₂
4. Global warming

Submitted by :- Muhammad Nawaz

1. Chemistry of plants
2. Chemistry of green pigments
3. Development of chemical products and processes less harmful to humans
4. Chemistry of greenhouse effect

Submitted by :- Muhammad Nawaz

1. Ozone and dust
2. SO₂ and NO₂
3. SO₃ and CO
4. CO₂ and CO

Submitted by :- Muhammad Nawaz

1. Floods in Yamuna river
2. Temperature mediated spoilage of
3. Weathering of marble
4. Air pollutants from Mathura refinery marble

Submitted by :- Muhammad Nawaz

1. Nitrogen oxides
2. Ozone
3. Sulphur dioxide
4. Carbon monoxide

Submitted by :- Muhammad Nawaz

1. Soil
2. Water
3. Animal respiration
4. Salts dissolved in ocean water

Submitted by :- Muhammad Nawaz

1. Carbon dioxide
2. Nitrogen oxide
3. Oxygen
4. Carbon monoxide

Submitted by :- Muhammad Nawaz