List four sources of sulphur dioxide in the air.

Asked by Topperlearning User | 20th Oct, 2016, 09:06: AM

Expert Answer:

  1. Burning of coal
  2. Metal smelting
  3. Paper production
  4. Industrial processes
  5. Thermal power plants

(Any Four)

Answered by  | 20th Oct, 2016, 11:06: AM

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