Urbanization and human activity creates a microclimate that is not environmentally healthful. Urban environments produce air pollution that harm the natural environment. Much of air pollution is concentrated in and around urban areas, where automobiles and industry emit mass amounts of waste into the environment. Visible air pollution, known as smog, is present in nearly all urbanized areas. Not only are humans affected adversely by bad air quality, animals also suffer.
Air pollution can also curb vegetation growth and reduce crop yields.
Air pollution from human activities harm all living creatures in the urbanized world. Human land use affects soils in the environment and increases the potential for erosion. There is a sharp peak in the amount of soil and sediment erosion after the construction phase of urbanization. Sediment can either be blown or washed away with rain and movement. Soil can also be scraped off and lost inducing desertification.