This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, Subject name: Social & Preventive Medicine
[{'content': 'Smoke index is used for - \nSelect and explain. \nA. Air pollution, B. Soundpollution, C. Excreta, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Air pollution Monitoring of air pollutiono Monitoring of air pollution is done by : -Sulphur dioxide.Gritt and dust measurement.Co-efficient of haze.Air pollution index.Smoke or soiling index", 'role': 'assistant'}]