Green zoning: An effective policy tool to tackle the Covid-19 pandemic.

Green zoning has emerged as a widely used policy response to tackle the Covid-19 pandemic. 'Green zones'-areas where the virus is under control based on a uniform set of conditions-can progressively return to normal economic and social activity levels, and mobility between them is permitted. By contrast, stricter public health measures are in place in 'red zones', and mobility between red and green zones is restricted. France and Spain were among the first countries to introduce green zoning in April 2020. Subsequently, more and more countries followed suit and the European Commission advocated for the implementation of a European green zoning strategy, which has been supported by the EU member states. While there remain coordination problems, green zoning has proven to be an effective strategy for containing the spread of the virus and limiting its negative economic and social impact. This strategy should provide important lessons and prove useful in future outbreaks. Research in epidemiology indicates that thoroughly implemented and operationalised green zoning can prevent the spread of a transmittable disease that is poorly understood, highly virulent, and potentially highly lethal. Finally, there is strong evidence that green zoning can reduce economic and societal damage as it avoids worst-in-class measures.