The concentration of PM25 in the whole country was

2022-08-06
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Ministry of environmental protection: in April and may, the concentration of PM2.5 nationwide decreased year on year.

Ministry of environmental protection: in April and may, the concentration of PM2.5 nationwide decreased year on year.

the average proportion of excellent days in April and may in 13 cities in Beijing Tianjin Hebei region was 54.0% and 62.5% respectively, with a year-on-year increase of 2.4 and 5.1 percentage points

among them, the concentration of fine particulate matter (PM2.5) decreased significantly. In April and may, the concentration of PM2.5 in Beijing Tianjin Hebei region was 58 and 47 μ g/m3, a year-on-year decrease of 13.4% and 16.1%

however, the problem of ozone pollution is getting worse. The over standard rate of ozone in the two months was 11.4% and 30.5% respectively, an increase of 1.3 and 4.5 percentage points year on year

in this regard, songguojun, director of the Institute of environmental policy and environmental planning of Renmin University of China, said in an interview that ozone pollution is mainly related to volatile organic compounds (VOCs) and nitrogen oxides (NOx), both of which are difficult to control

According to Luoyi, director of the environmental monitoring department of the Ministry of environmental protection, among the 74 cities, the 10 cities with relatively poor air quality in April (from 74th to 65th) are Jinan, Handan, Zhengzhou, Tangshan, Xingtai, Baoding, Hengshui, Xuzhou, Shijiazhuang and Xi'an; May: Tangshan, Baoding, Jinan, Xingtai, Shijiazhuang, Zhengzhou, Taiyuan, Wuxi, Handan and Chengdu

in the ranking of air quality in April and may, Hebei, the ten worst cities, took six and five seats respectively, which also reflects that the problem of air pollution in Hebei is still serious

the concentration of major pollutants in Beijing decreased year-on-year. The number of excellent days decreased year-on-year in April and increased year-on-year in May. The proportion of excellent days in April in Beijing was 53.3%, a year-on-year decrease of 3.4 percentage points; The proportion of excellent days in May was 61.3%, up 3.2 percentage points year-on-year. The concentration of PM2.5 in April and may was 68 and 54 μ g/m3 respectively, a year-on-year decrease of 5.6% and 3.6%

in terms of sub regions, the proportion of average excellent days in April and may in 13 cities in Beijing Tianjin Hebei region was 54.0% and 62.5% respectively, up 2.4 and 5.1 percentage points year on year. The concentration of PM2.5 was 58 and 47 μ g/m3, with a year-on-year decrease of 13.4% and 16.1%

the proportion of average excellent days in April and may in 25 cities in the Yangtze River Delta was 77.0% and 77.8% respectively, an increase of 3.0 and 0.3 percentage points year on year. The concentration of PM2.5 was 46 and 42 μ g/m3, a year-on-year decrease of 9.8% and 6.7%

the average proportion of excellent days in April and may in nine cities in the Pearl River Delta region was 98.1% and 87.1% respectively, which remained at a high level. The concentration of PM2.5 is 31 and 27 μ g/m3, and the concentration of PM10 is 46 to expand and strengthen the lithium battery industry and 42 μ g/m3, both reaching the national level II annual average concentration standard

it must be mentioned that in 338 prefecture level and above cities, the PM2.5 concentration in April and may was 42 and 38 μ g/m3 respectively, a year-on-year decrease of 8.7% and 11.6%

the pollutant concentration data in April and may show that the PM2.5 concentration nationwide has generally decreased year-on-year

the ozone exceeding standard rate in many regions rose against the trend

compared with the most concerned PM2.5 concentration, the ozone exceeding standard rate in many regions rose against the trend

some experts said that in recent years, the government has mainly focused on the reduction of PM2.5 concentration in the air pollution control with the large passenger aircraft project as the carrier, and not much on ozone

the ozone exceeding standard rate of 13 cities in Beijing Tianjin Hebei region in April and may was 11.4% and 30.5%, with a year-on-year increase of 1.3 and 4.5 percentage points; Due to the close relationship with people's lives, the ozone exceeding standard rate of 25 cities in the Yangtze River Delta in April and may was 16.1% and 18.2%, which increased by 0.9 percentage points year-on-year in April and decreased by 1.0 percentage points year-on-year in May; The ozone exceeding standard rate of 9 cities in the Pearl River Delta region in April and may was 1.1% and 12.9%, with a year-on-year decrease of 7.8 percentage points in April and an increase of 12.2 percentage points in May

strive to restore your economy. Research shows that only 23% of the ozone pollution in the near surface layer each year comes from the ozone layer transmission of nature itself, up to 48% comes from the photochemical reaction of pollutants such as NOx, and the rest comes from the long-distance transmission outside the region

ozone is not easy to control. It is related to VOCs and NOx. Songguojun said that VOCs emissions involve gas stations, factories, coatings, furniture, etc., and the front end is easy to control. However, it is difficult to control at the product end, such as coatings, nail polish, etc. NOx control is more difficult, including natural gas combustion, vehicle emissions, etc

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