“The reductions in air pollution in China caused by this economic disruption likely saved twenty times more lives in China than have currently been lost due to infection with the virus in that country,” Burke wrote on G-Feed, a site run by a group of scientists researching the relationship between society and the environment.
According to China’s Ministry of Ecology and Environment, the average number of “good quality air days” increased 21.5% in February, compared to the same period last year in Hubei province, the epicenter of the global coronavirus pandemic.
Based on actual pollution data from four cities in China for 2016 to 2019, he calculated the reduction in pollution to be between 15 and 18 micrograms per cubic meter of air, or ug/m3.
To avoid overestimating the impact, Burke then rounded the reduction down to 10 ug/m3, and assumed only people living in urban areas would benefit from the cleaner air.
Burke was also able to tap into existing data showing the health benefits that cleaner air in China can have — from the 2008 Beijing Olympics when Chinese authorities imposed strict pollution controls.
Scientists analyzed the impact of these measures and found they dramatically reduced the number of premature deaths among children under five and adults over 70. The research suggested that monthly mortality of children under five increased 2.9% for every 1ug/m3 increase in PM2.5, and about 1.4% for people over 70 years old.
Based on those calculations, and considering a number of caveats, Burke calculated that the two months of cleaner air resulting from the coronavirus restrictions has saved the lives of between 1,400 and 4,000 children under 5, and 51,700 to 73,000 adults over 70 in China.
He said that while the cleaner air had likely saved lives, the broader disruption caused by Covid-19 could cause many additional deaths not directly attributable to being infected with the virus — for example because of declines in economic well-being or the difficulty in accessing health services during the epidemic.
“Does this mean pandemics are good for health? No,” he said. “Instead it means that the way our economies operate absent pandemics has massive hidden health costs, and it takes a pandemic to help see that.”