High levels of air pollution in the UK, which are a major cause of illness and early death and cost the NHS and society an estimated £20 billion each year, are being addressed by designating areas of city centres as Clean Air Zones (CAZs) or Low Emission Zones (LEZs). These aim to restrict the movement of older and higher polluting vehicles to improve air quality but, in the wake of the Covid-19 pandemic and other global and financial instabilities, many councils are struggling to make the case for their implementation. Here we look at the different CAZs and where some are being delayed.

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