No serious pollution day in Beijing

On May 13, the Beijing Municipal Bureau of ecological environment issued the “Bulletin of Beijing’s ecological environment in 2020” (hereinafter referred to as the “bulletin”) to summarize and review the ecological environment in 2020《 According to the communique, the air quality of the whole city will be significantly improved in 2020, and there will be no serious pollution day in the whole year. In the same period, the city’s surface water quality improved significantly, the soil environment was generally good, the sound environment quality remained stable, and the radiation environment quality remained normal. The improvement of ecological environment has laid a foundation for biodiversity in Beijing. The field survey found that there are 70 species newly recorded in Beijing, among which 12 species are newly recorded in China.

The average annual concentration of PM2.5 entered “30 +” for the first time

The improvement of ecological environment quality in Beijing is first reflected in the dynamic change of air quality. In 2020, the annual average concentration of fine particulate matter (PM2.5) in the city’s air will be 38 μ g / m3, which will enter the “30 +” level for the first time. In 2020, there will be 276 days of air quality up to standard, accounting for 75.4%, 90 days more than in 2015. The number of days of heavy air pollution was 10, 36 days less than that in 2015. There was no serious pollution day in the whole year.

In terms of regional distribution, Miyun, Huairou, Yanqing, Mentougou, Changping, Pinggu, Shunyi and Fangshan are the first districts to reach the national secondary standard, accounting for about 80% of the city area.

The annual average concentrations of sulfur dioxide (SO2), nitrogen dioxide (NO2) and inhalable particulate matter (PM10) are 4 μ g / m3, 29 μ g / m3 and 56 μ g / m3 respectively, which all meet the national secondary standard. Compared with 2015, the annual average concentrations of PM2.5, SO2, NO2 and PM10 decreased by 52.9%, 70.4%, 42% and 44.8% respectively. The 24-hour average 95th percentile concentration of carbon monoxide is 1.3 mg / m3, reaching the national second level standard; The 90th percentile value of ozone daily maximum 8-hour moving average is 174 μ g / m3.

At the same time, the surface water, soil and acoustic environment were also improved. The annual average concentration of main pollution indicators continued to decrease, the number of inferior class V water bodies in key river basins further decreased, and the inferior class V water bodies in national control sections were completely eliminated; Classified management of agricultural land, risk control of construction land and effective control of soil environmental risk are implemented; The annual average values of daytime equivalent sound level in class 1, class 2, class 3 and class 4A areas meet the national standard.

“In 2020, the Eco-environmental Status of the city will be rated as” good “, and the Eco-environmental Status Index (EI) will be 70.2, which will continue to improve for six consecutive years.” Liu Wei, director of the ecological environment monitoring department of the Municipal Bureau of ecological environment, said that compared with 2015, the city’s ecological environment index has increased by 9.3%. From the distribution of functional areas, the ecological environment index (EI) of the capital functional core area increased by 15.1%, the central urban area increased by 14.4%, and the plain area increased by 16.9%; The Eco-environmental Status Index of ecological conservation area increased by 7.8%.

70 species are newly recorded

Beijing has complex topography, diverse habitat types and rich biodiversity, which plays an important role in the ecological pattern of Beijing Tianjin Hebei. The gradual improvement of the city’s ecological environment has also laid a good foundation for biodiversity.

It is understood that in 2020, 82 natural and semi natural ecosystem formations were recorded in Beijing, including forest, shrub, grass, meadow and grassland, wetland and other types. 5086 species have been recorded. 70 species were newly recorded in Beijing, among which 12 species were newly recorded in China.

Among the 70 newly recorded species, 3 are vascular plants, 16 are insects, 40 are bryophytes and 11 are macrofungi; Among the 12 species newly recorded in China, 11 are macrofungi and 1 is insect. 19 species of alien invasive species were included in the list of four batches of alien invasive species in China.

“Biodiversity has a comprehensive indicator effect on the quality of ecological environment. Field investigation found that the distribution range of some indicator species sensitive to environmental quality expanded.” Cao Zhiping, director of the nature and ecological protection department of the Municipal Bureau of ecological environment, said that aquatic organisms with high water quality requirements, such as Ranunculus japonicus and Ranunculus nigripes, are distributed in Huairou, Miyun, Yanqing and a few central urban areas, which to a certain extent shows the effect of comprehensive river management and ecological restoration on the improvement of water environment.

Since 2020, the Beijing Municipal Bureau of ecological environment has organized a city wide biodiversity survey, which is the first of its kind in Beijing. It is estimated that it will take 3-5 years to find out the background of biodiversity in Beijing, and gradually incorporate biodiversity monitoring into routine ecological monitoring. The survey mainly relies on man-made, and the key ecological spaces such as nature reserves, woodlands, natural parks, virgin forests and wetlands are selected.

Beijing Business Daily reporter Tao Feng Liu Hanlin

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