Why can't we solve air pollution from traffic signals?

Team ProbSol

Discovered - air pollution problem from vehicles piled up at signals causing massive traffic jams leading to air pollution

CO emissions ProbSol
Graphs of exhaust emission of CO, HC vs velocity of the vehicle
HC emissions
It can be seen that more amount of CO, HC is released when the vehicle is idling due to incomplete combustion of the fuel in the engines. Same applies to NOx emissions as well.

Arduino prototype traffic system

Comment below with your suggestions to make this prototype better
Click like if you think this could be developed into a solution for local roads of the country