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Not sure how that would address pollution but where I live they've started replacing carpool lanes with "pay to drive in the fast lane".
If your commute was 25 miles and your car got 25mpg, it would save 1 gallon of gas burned for your commute if you opted to carpool with someone and leave your car at home.
If the HOV lane costs the other cars 1mpg in mileage (it's more), that would mean that you would need 1 in every 25 people to leave their car at home and carpool in order to just merely break even on a gallon of gas being burned.
Obviously there's way more variables than that but it's a rough estimate in how many people would need to leave their cars at home in order to utilize the HOV lane. Whether it would require 1 in 25 or 1 in 50, we know that there are tens of thousands of cars commuting through a normal sized city per day. There's no way that the amount of people opting to leave their cars at home is more than the gas mileage lost by the rest of the commuters.