<prompt> Which of the following is the best parameter to measure air pollution?SO2CO2CON20  <response>: The best indicators of air pollution are sulphur dioxide SO2, smoke and suspended paicles. These are monitored on a daily basis over several sites. The results are then collected by a central agency. Methods for monitoring air pollution: Sulphur dioxide Smoke or Soiling index Grit and dust measurement Coefficient of haze Air pollution index Ref: Parks Textbook of Social and Preventive Medicine, 19th edition, Page 593. 