What are the common environmental pollution? What are the sources?

Sewage, waste gas, waste, noise, light pollution, etc., for the city common pollution.

Source:

(1) Sewage: domestic wastewater, industrial wastewater, oil and toxic substances and garbage.

(2) Air: Industrial exhaust, car exhaust, home kitchen fumes, pesticides, new plastic products, Freon refrigerator and all kinds of garbage, waterways gases.

(3) Noise: Family noise, traffic noise, construction noise, social noise (selling, firecrackers, shops, sound, etc.)

(4) Light: visible light, laser light, infrared light, ultraviolet light, etc.

(5) Food: additives, artificial colors and pesticides.