My opinion on pollution,
Stop the money saving quick jobs on Roads,
Make it compulsory that every car / motor bike gets serviced at least twice an year,
HGVs / Buses get regular servicing due to their mileage,
The EU Regulations on HGVs are 50mph, this causes unnecessary gear changing for the Power in the things, (know from personal experience)It should be set at 60mph, this lessons gear changing, might not go down with a lot of people but it stops "Bunching nose to tail of HGVs),