What is the current climate / environment state of city centers?

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Exposure to natural disasters


Air pollution

In many of today’s modern cities, the main environmental health hazard to the population is exposure to air pollution.

The three main air pollutants are:

1. Suspended Particles – made up of soot, smoke, dust and liquid droplets.
2. Associated health hazard: particles and soot exposure over a long period of time is related to a wide range of chronic respiratory illness such as asthma and chronic obstructive pulmonary diseases as well as worsening heart conditions and other conditions.
3. Sulfur Dioxide – produce by the combustion of fossil fuels, on the whole, motor vehicles and small and varied sources (such as boilers and stoves) contributing the most.
4. Associated health hazard: causes acid rain and can be extremely detrimental to the health of the young and elderly.
5. Nitrogen Dioxide – caused by fuel combustion, aerobic decomposition and nitrogenous fertilizers.

Associated health hazard: causes acid rain and can damage lung tissue by forming into acid in the presence of water.

Source: http://www.portfolio.mvm.ed.ac.uk/studentwebs/session4/27/citydiff.htm