Ozone has become the main culprit of air pollution in summer months, instead of PM2.5 particles, according to the Hangzhou Environmental Protection Bureau.
The bureau said the city’s ozone level began to rise in May and reached its peak in August due to high temperatures.
An expert at the Hangzhou Environmental Monitoring Center said a high density of ozone in the air can irritate the eyes and lungs and affect the growth of plants.
People are advised to stay indoors when the ozone level is very high.
Source: Hangzhou International Center