The welcome return of China’s economy is bringing with it some unwelcome company, as air pollution levels have returned to pre-lockdown levels across the country. Major pollutants have exceeded concentration levels from a year ago for the first time since the start of Covid-19 lockdowns in January, according to a new report from Centre for Research on Energy and Clean Air. The rebound from declines of as much as 40% come as factories restart and traffic returns to city roads.

relates to A Return to Normal in China Means Air Pollution is Back in Force

Source: Centre for Research on Energy and Clean AiSoaring smog indicates that the economic recovery has been led by the country’s most highly polluting sectors, said Lauri Myllyvirta, the center’s lead analyst. It also underscores the fear of many environmentalists that any post-virus stimulus package will lean heavily on heavy industry, similar to what happened after the 2008 financial crisis.

“Rebounding air pollutant levels are a demonstration of the importance of prioritizing green economy and clean energy in the recovery from the Covid-19 crisis,” Myllyvirta said in the report. “All eyes are on China as the first major economy to return to work after a lockdown.”