A head start on in one nine hundred seventy five singapore became the first city to levy an entry fee for vehicles today it's one of the cleanest cities in asia. on the other hand you have to see that in india or china besides the industrial production which is going on all over the city as traffic also plays a huge role and they won't get their air quality problems sorted out if they don't start taking action on their traffic. and people are increasingly migrating to the cities a global trend siemens highlights in the crystal cities offer jobs culture hospitals it's senseless to keep pollutin...