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**Paul** · 25-09-2023, 18:31

A car doing 20mph is going to be on the same stretch of road for 50% longer, so if its putting out the same amount of pollution, you would expect the overall pollution level of that stretch to rise (by 50% ?). However, I dont know if a car puts out the same amount of pollutants at 20mph compared to 30mph.

25-09-2023, 18:31	#36
Paul Dr Pepper Addict Cable Forum Team Join Date: Oct 2003 Location: Nottingham Age: 62 Services: IDNet FTTP (1000M), Sky Q TV, Sky Mobile, Flextel SIP Posts: 30,013	Re: 20mph is just the start. A car doing 20mph is going to be on the same stretch of road for 50% longer, so if its putting out the same amount of pollution, you would expect the overall pollution level of that stretch to rise (by 50% ?). However, I dont know if a car puts out the same amount of pollutants at 20mph compared to 30mph. __________________ Baby, I was born this way.