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
All are used for monitoring of air pollution except- 
Select and explain. 
A. Haze coefficient, B. Air pollution index, C. Smoke index, D. Kanawati index
D: Kanawati index
Answer: D: Kanawati index 
Explanation: Ans. is 'd' i.e., Kanawati index 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