Now many cities have become more and more serious air quality problems due to urban construction and development problems. Which cities have the best air quality? Recently, the Ministry of news and ecological environment of Shenzhen reported the national air quality in March. Among the 168 cities in China, the top 10 cities with the best air quality are Haikou, Lhasa, Shenzhen, Huizhou, Zhongshan, Huangshan, Zhoushan, Ya'an, Zhuhai and Fuzhou. So what are the last cities with poor air quality? This article brings you the air quality ranking list in March 2019. Let's take a look at the air quality of major cities.
The average proportion of excellent days in 337 prefecture level and above cities in March 2019 was 88.3%, an increase of 5.1 percentage points year-on-year; The concentration of PM2.5 was 41 μ g / m3, a year-on-year decrease of 4.7%; PM10 concentration was 74 μ g / m3, a year-on-year decrease of 1.3%; O3 concentration was 116 μ g / m3, a year-on-year decrease of 5.7%; SO2 concentration was 12 μ g / m3, a year-on-year decrease of 20.0%; NO2 concentration was 30 μ g / m3, the same as that of the same period last year; The CO concentration was 1.2 mg / m3, unchanged year-on-year.
From January to March, the average proportion of excellent days was 76.9%, an increase of 0.1 percentage points year-on-year; The ambient air quality of 96 cities reached the standard, an increase of 28 over the same period of last year; The concentration of PM2.5 was 54 μ g / m3, with a year-on-year increase of 1.9%; PM10 concentration was 84 μ g / m3, unchanged year-on-year; O3 concentration was 105 μ g / m3, a year-on-year decrease of 3.7%; SO2 concentration was 14 μ g / m3, a year-on-year decrease of 22.2%; NO2 concentration was 32 μ g / m3, with a year-on-year increase of 3.2%; The CO concentration was 1.6 mg / m3, unchanged year-on-year.
The average proportion of excellent days in March in '2 + 26' cities in Beijing, Tianjin, Hebei and surrounding areas was 74.5%, an increase of 20.8 percentage points year-on-year; The concentration of PM2.5 was 54 μ g / m3, a year-on-year decrease of 28.0%. From January to March, the average proportion of excellent days was 49.1%, a year-on-year decrease of 3.8 percentage points; The concentration of PM2.5 was 90 μ g / m3, with a year-on-year increase of 8.4%.
The proportion of excellent days in Beijing in March was 71.0%, an increase of 25.8 percentage points year-on-year; The concentration of PM2.5 was 52 μ g / m3, a year-on-year decrease of 38.8%. From January to March, the proportion of excellent days was 71.1%, an increase of 3.3 percentage points year-on-year; The concentration of PM2.5 was 52 μ g / m3, a year-on-year decrease of 7.1%.
The average proportion of excellent days in 41 cities in the Yangtze River Delta in March was 84.2%, a year-on-year decrease of 3.1 percentage points; The concentration of PM2.5 was 51 μ g / m3, a year-on-year increase of 6.2%. From January to March, the average proportion of excellent days was 70.6%, a year-on-year decrease of 2.1 percentage points; The concentration of PM2.5 was 61 μ g / m3, a year-on-year decrease of 1.6%.
The average proportion of excellent days in 11 cities in Fenwei plain in March was 79.2%, an increase of 26.1 percentage points year-on-year; The concentration of PM2.5 was 47 μ g / m3, a year-on-year decrease of 35.6%. From January to March, the average proportion of excellent days was 45.2%, a year-on-year decrease of 1.0 percentage points; The concentration of PM2.5 was 95 μ g / m3, a year-on-year increase of 9.2%.
In March 2019, among the 168 key cities, Zibo, Zaozhuang, Weifang, Linyi and other 20 cities had relatively poor air quality (from 168 to 149); The air quality of 20 cities such as Haikou, Lhasa and Shenzhen is relatively good.
From January to March 2019, among the 168 key cities, 20 cities such as Linfen, Shijiazhuang and Xingtai have relatively poor air quality (from 168 to 149); The air quality of 21 cities such as Lhasa, Haikou and Shenzhen is relatively good.