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1、Release Date:May 2022SENSING CHANGE How cities are using new sensing technologies to achieve air quality goalsFOREWORD Air pollution is a global health crisis and the largest environmental health threat the world currently faces.Nearly 13 people every minute die due to exposure to air pollution,maki

2、ng it the worlds fourth-leading risk factor for early death.Despite improvements in air quality in some countries,pollution levels remain far too high in many of the worlds most-populous and fastest-growing cities.In September 2021,when the World Health Organisation(WHO)updated its Air Quality Guide

3、lines,it spoke loudly and clearly on the profoundly harmful effects of air pollution,even at very low levels.Over the past few decades,a growing body of literature has reinforced how poor air quality negatively affects people of all ages,leading to ill health,increased hospital admissions and reduce

4、d life expectancy.This research underscores the public health imperative of actions to end our reliance on fossil fuels.The only pathway to creating breathable air in our cities is by decarbonising all sectors of our economy and eliminating fossil fuel combustion.Fortunately,the solutions to improve

5、 air quality already exist,and have proven to be effective in many of the worlds leading cities.To date,38 C40 mayors have signed the C40 Clean Air Cities Declaration,committing to take bold action on sources of air pollution within their cities to bring levels in line with World Health Organisation

6、 Air Quality Guidelines.Air quality monitoring is a fundamental tool to ensure clean air in our cities.As well as providing data to understand pollution risk and information on sources and location of pollution,it can also evaluate how well policies are working and empower residents with information