Next Section Cities in coastal regions will be directly affected by the rise in the sea level. However, science can't predict exactly what will happen in each city or region of the world. The greenhouse effect has varying impacts from region to region, but the following impacts are likely. Both increased heat and increased air pollution will cause more deaths in cities. In most cities, higher temperatures mean more air pollution.
Heat facilitates the formation of ground level ozone - a primary ingredient of urban smog.
As temperatures peak in cities, so do ozone levels. Smog inevitably results. Smog aggravates respiratory ailments such as emphysema and asthma. Children and older adults are especially at risk. That doesn't include those who suffer without being hospitalized.