Congested urban areas lead to more pollution. Identify how pollution occurs in an urban area and explain how your city will prevent or decrease the amount of pollution. Remember to be specific and address multiple types of pollution.
Physical impurity or contamination; (now) esp. the presence in or introduction into the environment (esp. as a result of human activity) of harmful or poisonous substances, or excessive levels of light, noise, organic waste, etc
Berkshire Encyclopedia of Sustainability Vol. 5 by William Smith (Editor); Robin Kundis Craig (Editor); John Copeland Nagle (Editor); Bruce Pardy (Editor); Oswald Schmitz (Editor)