So we can fix the problem by adding pollution, planting trees where there is traffic congestion and maintain a vehicle's engine, the exhaust emissions reductions.
So we can add to the pollution by planting trees at River with traffic congestion and maintain the mechanical condition of the vehicle to complete to reduce exhaust emissions.
So we can solve the problem of pollution by adding plant leaf river with the traffic congestion and maintain the state of vehicle to complete to reduce exhaust emission.