Has COVID-19 put the brake on clean air zones?
Clean air zones (CAZs) are a central pillar of the government’s response to air pollution. Although charging CAZs, where drivers of certain classes of vehicle are charged for entering the zone, have not been universally popular, they have the potential to have a substantial impact on air quality. London’s ultra-low emission zone which follows a similar approach has reportedly led to a 37% drop in NO2 concentrations within the central zone.
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