Arrange the following fuels in the decreasing order of air pollution caused by burning a kilogram of each of them :

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Q: 108 (CAPF/2014)
Arrange the following fuels in the decreasing order of air pollution caused by burning a kilogram of each of them :
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question_subject: 

Science

question_exam: 

CAPF

stats: 

0,46,38,22,46,13,3

keywords: 

{'fuels': [0, 1, 0, 1], 'air pollution': [5, 0, 0, 3], 'diesel': [1, 0, 0, 1], 'petrol': [2, 0, 1, 5], 'order': [6, 12, 34, 35], 'kilogram': [0, 0, 0, 1], 'cng': [0, 0, 1, 2]}