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This study by the International Gas Union (IGU) highlights the interconnection that exists between reducing greenhouse gas emissions and reducing emissions of other air pollutants. It presents case studies of efforts in four cities — New York, Istanbul, Toronto, and Beijing — that have tackled or are tackling the issue of improving urban air quality and where gas has featured as the main contributor to their efforts. These cities can provide lessons for other cities seeking to reduce the potentially severe health consequences of urban air pollution.