In the first half of the year, the concentration of PM2.5 in the Beijing-Tianjin-Hebei region decreased. Although the air was the worst, the top ten accounted for eight, but the air quality improved better than the national average. The Ministry of Environmental Protection announced yesterday that compared with the same period last year, 74 cities in the first half of this year. The overall air quality has improved, and the average number of days reached the standard has risen to about 60%. The air quality improvement in the Beijing-Tianjin-Hebei region is better than the national average.
The Ministry of Environmental Protection said that with the implementation of the relevant measures of the Air Pollution Prevention and Control Action Plan and the favorable weather conditions, the air quality standard days in 74 cities nationwide increased from 58.7% to 60.3%, and the frequency and duration of heavy air pollution occurred. Both the time and the intensity of the pollution are significantly reduced.
The monitoring results showed that in the first half of the year, the average concentration of PM2.5 in 74 cities was 70μg/m3, which was 7.9% lower than that of the same period of last year; the average concentration of PM10 was 115μg/m3, which was 6.5% lower than the same period of last year. Of the six pollutants monitored, only the ozone concentration increased.
From the national air quality rankings, the top ten airs in the first half of the year were Xingtai, Shijiazhuang, Baoding, Tangshan, Handan, Hengshui, Jinan, Langfang, Xi'an and Tianjin; Beijing-Tianjin-Hebei is still the “hardest hit” of air pollution, 10 There are 8 names on the list in the city.
However, from the perspective of the number of days of compliance, the air quality of Beijing-Tianjin-Hebei has improved compared with the same period last year. In the first half of the year, the average number of days in Beijing and Tianjin was increased from 33.2% to 36.4%, an increase of 3.2 percentage points. The average concentration of PM2.5 decreased by 13.0% and PM10 decreased by 9.8%, and the improvement rate was higher than the national average.
Analysis of more and more ozone pollution in cars More and more serious The Ministry of Environmental Protection reported the air quality situation in the first half of the year yesterday. Under the other monitoring data, the average concentration of ozone in the three regions increased to varying degrees. Among them, the average concentration of ozone in Beijing and Tianjin in the first half of the year increased by 7.2% over the same period last year.
Pan Xiaochuan, a professor at the School of Public Health of Peking University, pointed out that the ozone problem in the generally sunny Yangtze River Delta and Pearl River Delta regions is more prominent. The summer ozone problem encountered in the Beijing-Tianjin-Hebei region may be related to global warming and automobile growth. related.
Pan Xiaochuan said that the tail gas of a car is easily irradiated by the sun, especially at noon or afternoon in summer. The solar radiation is strong and the ozone concentration is easily increased in a short time. “After the climate warms, the temperature is getting higher and higher, and the sun's radiation will increase. In the case of more and more cars, the probability of ozone pollution is definitely higher and higher.”
“When the concentration of ozone is high, people can inhale the air and it is easy to cause acute irritation to the trachea and lungs.” Pan Xiaochuan said that in a short period of time, people inhale a lot of ozone, and the ozone will react with the water in the trachea to produce The strong oxidizing hydrogen peroxide directly stimulates the contraction of the trachea, causing paralysis and easily induces asthma.
He pointed out that unlike PM2.5 pollution, ozone pollution is difficult to judge visually. When the sun is shining, it is likely that the ozone concentration has exceeded the standard. Therefore, Pan Xiaochuan reminds everyone, especially children, the elderly and sensitive people with respiratory diseases, to minimize their exit when there is strong noon or afternoon sunshine. If you go out, try to stay away from the road. "In the vicinity of traffic trunks, car exhaust is exposed to sunlight, and ozone is easily formed. Ozone itself is unstable and can be easily decomposed into oxygen. People are farther away, and the ozone concentration may be lower, so that it will not be inhaled in a short time. ozone."

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