One positive thing to come out of the coronavirus pandemic is that China’s skies were free of smog for months. But air pollution has returned with a vengeance as factories rush to ramp up output after going idle during the outbreak.
Levels of toxic pollutants including nitrogen dioxide and tiny particles known as PM2.5 were all higher in April compared to the same period last year, data released by Greenpeace China on Friday showed.
“What is interesting is how rapidly the emissions have rebounded after the sharp fall seen in the first three months of the year,” Li Shuo, a climate and energy expert at Greenpeace China, said.
“This may be an early sign that the positive trends seen during the epidemic period might be quickly reversed.”
Levels of PM2.5 across China fell by more than 18 per cent between January 20 and April 4 amid city-wide lockdowns and strict travel restrictions, according to the environment ministry.
Satellite images released earlier by Nasa and the European Space Agency showed that nitrogen dioxide emissions in major Chinese cities in central and eastern China – where most chemical, steel and cement plants are located – were down by 30 per cent in the first two months of the year.
But the level of PM2.5 particles in a cubic metre of air in April was 33.93, a slight increase from 33.2 in the same period last year.
The level of nitrogen dioxide in a cubic metre of air in April was 25.4 compared with 24.6 in the same month last year.
Both pollutants are toxic by-products of burning coal, oil and gas and can cause asthma, heart diseases and can even weaken the immune system, making people more susceptible to contracting other illnesses.
Electricity production was up 1.2 per cent in April. China relies on coal for most of its energy, Li said.
Exposure to chronic air pollution has shortened China’s average life expectancy by more than four years, according to the World Health Organisation.