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Haikou tops the 168 key Chinese cities in terms of the air quality last year, followed by Lhasa, Huangshan, Zhoushan and Fuzhou, according to the Ministry of Ecology and Environment.
From January to December in 2021, days of "A" and "B" classes accounted for 87.5 percent of the whole year in 339 cities above the prefectural level.
The average PM2.5 concentration was 30 micrograms per cubic meter, down 9.1 percent year-on-year.
However, Linfen, Taiyuan in Shanxi province, and Hebi in Henan province presented relatively poor air quality.
No 10 Zhuhai in Guangdong province
Aerial photo taken on April 20, 2020, shows the view of Wailingding Island in Zhuhai, South China's Guangdong province.
No 9 Huizhou in Guangdong province
The night view of Huizhou in South China's Guangdong province.
No 8 Shenzhen in Guangdong province
Aerial photo taken on Sept 11, 2020, shows the city view of Shenzhen, in South China's Guangdong province.
No 7 Lishui in Zhejiang province
Aerial photo taken on April 30, 2021, shows a tea picking competition at a tea garden in Sanshi village, Jingning She autonomous county in Lishui, East China's Zhejiang province.
No 6 Xiamen in Fujian province
Aerial photo taken on Oct 6, 2021, shows the view of Gulangyu Island in Xiamen, Southeast China's Fujian province.
No 5 Fuzhou in Fujian province
Aerial photo taken on July 10, 2021 shows a view of the historical and cultural block of Sanfangqixiang (Three Lanes and Seven Alleys) in Fuzhou, East China's Fujian province.
No 4 Zhoushan in Zhejiang province
Aerial photo taken on June 24, 2021, shows tourists riding a speedboat in Zhoushan, East China's Zhejiang province.
No 3 Huangshan in Anhui province
Photo taken on March 10, 2021, shows cloud-shrouded mountain in the Huangshan Mountain scenic area in East China's Anhui province.
No 2 Lhasa in Southwest China's Tibet autonomous region
Photo taken with a mobile phone shows the autumn scenery in Lhunzhub county of Lhasa, Southwest China's Tibet autonomous region, on Oct 16, 2021.
No 1 Haikou in Hainan province
Aerial photo taken on May 3, 2021, shows the Haikou bay seaside walking road in Haikou, capital of South China's Hainan province.