Pollution Problem in Delhi NCR

And it’s not like cities like Mumbai, Kolkata etc don’t have cars, dusts and industries
May be its something related to hot and humid air of Mumbai/Kolkata against cold and dry air of Delhi which causes issue. Not sure.

Increasing bus fare is stupidest idea. Buses would be running on roads even if no passengers are travelling, because most of them have to follow pre-scheduled routes.
 
What about the health hazards the volunteers are subjected to who stand on the roads holding the sign boards?
 

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