噪音污染
Cars also contribute to pollution of air and water. Though a horse produces more waste, cars are cheaper, thus far more numerous in urban areas than horses ever were. Emissions of harmful gases like carbon monoxide, ozone, carbon dioxide, benzene and particulate matter can damage living organisms and the environment. The emissions from cars cause disabilities, respiratory diseases, and ozone depletion. Noise pollution from cars can also potentially result in hearing disabilities, headaches, and stress to those frequently exposed to it.