The correct answer should be <span>none of the above
It would actually help in reduction of air pollution since fewer cars would be used and other vehicles that harm the environment since more people would be using the mass transit. Traffic congestion would also be reduced for the same reason, fewer cars fewer problems. Temperature of the urban heat would also be reduced for absolutely the same reason.</span>
Building a mass transit system is likely to do "<span>none of the above", since although there are definitely negative effects of building such a system, one of the greatest benefits is less congestion.</span>
