London’s Mayor extended the first air quality warning since August 2020 for another day after pollution levels mushroomed throughout the week. A cocktail of high atmospheric pressure, little wind and peak farming season emissions made London’s air quality worse than Beijing’s on Friday. While pollution normally rolls into London from central and southern Europe at this time of the year, there’s currently a lack of wind to blow emissions out of the city, according to Andrew Grieve, senior air quality analyst at Imperial College London’s Environmental Research Group. “By the time we [got] to Friday, we’ve had essentially five days of pollution gradually building up,” he said. Springtime is also when farmers across the U.K. and the continent spread fertilizer, which further worsens air quality. The alert, which initially covered Tuesday through Thursday, was renewed after Imperial College London […]