LAHORE has received another warning that its air pollution crisis cannot be treated as a problem that begins with winter smog. A new assessment by the EU’s Copernicus Atmosphere Monitoring Service places the city among those with “extremely poor” ground-level ozone levels. Unlike the protective ozone layer high in the atmosphere, ground-level ozone is a harmful pollutant formed when sunlight and heat act on emissions from vehicles, industry and other sources. The finding is especially troubling because rising temperatures can........

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