October 2021, which cities had the best air quality across China?

Haikou’s Air Quality

On November 19, the Ministry of Ecology and Environment issued a notice on the state of surface water and ambient air quality throughout China for October 2021. Among them, Haikou’s ambient air quality ranks first among 168 key cities.

According to reports, among the 168 key cities across China in October 2021, the top 5 cities in terms of air quality were Haikou, Lhasa, Ziyang, Kunming, and Fuzhou.

From January to October, among 168 key cities across the country, the top 5 leading cities in air quality are Haikou, Lhasa, Huangshan, Zhoushan, and Lishui.

According to data released by the Haikou Municipal Bureau of Ecology and Environment in October this year, Haikou City hads 100% of days with good air quality, an increase of 3.2% compared with the same period last year.

Prevention and control of air pollution

In order to improve air quality over the coming winter months, from November 17 to the end of February 2022, Haikou will carry out prevention and control of air pollution across the city.

The 100-day action will take measures on: dust control, exhaust gas remediation, excessive emissions inspections, oil fume control and fire bans to control local air pollution sources.

When measuring air quality, a number of pollutants are measured as criteria. The main six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides.

Concentration of pollutants in Haikou City as of 22 November, 10:20 am



Five stations across Haikou City take live Air Quality Index readings (AQI) these are located at Xiuying Hainan hospital, Longhua Road, Hainan Normal University, Dongzhai Port, and Hainan University.

Haikou Air Quality Forecast

Air quality forecast for Haikou 21-27 November 2021

Air Quality Index characteristics

Air Quality Index (AQI) scale

“Good” AQI is 0 – 50. Air quality is considered satisfactory, and air pollution poses little or no risk.

“Moderate” AQI is 51 – 100. Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people. For example, people who are unusually sensitive to ozone may experience respiratory symptoms.

“Unhealthy for Sensitive Groups” AQI is 101 – 150. Although the general public is not likely to be affected at this AQI range, people with lung disease, older adults, and children are at greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

“Unhealthy” AQI is 151 – 200. Everyone may begin to experience some adverse health effects, and members of the sensitive groups may experience more serious effects.

“Very Unhealthy” AQI is 201 – 300. This would trigger a health alert signifying that everyone may experience more serious health effects.

“Hazardous” AQI is greater than 300. This would trigger health warnings of emergency conditions. The entire population is more likely to be affected.

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Related article: Haikou Blue sky’s: three-year action plan to clean up the air we breathe

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