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➔ Cities are home to over half the world’s population and growing, all concentrated on only 2% of its surface area, producing 80% of all GHG emissions

➔ Where there are no strict emission controls, air contaminants from industry and transportation may become toxic
and lethal

➔ Air pollution is a leading cause of death globally, triggering cancer, heart disease, and acute respiratory illnesses, and common asthma

➔ Technology and government regulation play a major role in making the air safer

➔ However, access to technology and capacity to implement regulation are lowest in parts of the developing world where air pollution is highest