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
'Soiling Index' is an indicator of 
Select and explain. 
A. Water pollution, B. Air pollution, C. Soil pollution, D. Food pollution
B: Air pollution
Answer: B: Air pollution 
Explanation: Ans. b (Air pollution) (Ref. Park Textbook of Preventive & Social Medicine 22nd/pg. 683)SOILING INDEX (Smoke Index) is indicator of air pollution.Other indicators of air pollution are:# SO2# Grit & Dust Measurement# Coefficient of Haze# Air Pollution IndexNote: The best indicators of air pollution are sulphur dioxide, smoke and suspended particles.