According to the monitoring data of the Ministry of Environmental Protection, on the second day of the New Year, among the 86 cities monitored nationwide, the air quality in 27 cities was mild and slightly polluted, and only two cities had the best air quality.
Among them, the air quality in Beijing was slightly polluted yesterday, and the worst air quality areas on that day were Huangcun Town in Daxing and liangxiang town in Fangshan District.
statistics
Air pollution in 27 cities in China
According to the monitoring data of the Ministry of Environmental Protection, the air quality in 22 cities including Beijing was slightly polluted yesterday.
In addition, five cities, including Mudanjiang, are lightly polluted.
The reporter noted that among the monitored cities, only two cities have excellent air quality, namely Lhasa and Zhanjiang.
In addition to the above cities, the air quality in other monitored cities is good.
The air pollution index in Beijing yesterday was 1 1 1, and the primary pollutant was inhalable particulate matter, which was mild pollution.
According to the monitoring data of Beijing Environmental Protection Monitoring Center, the worst air quality areas in Beijing on that day were Huangcun Town in Daxing and liangxiang town in Fangshan District, with the pollution index of 130, while in the urban area, Dongsi in Dongcheng District had the worst air quality on that day, with the pollution index of 129.
Air Quality in 86 Cities (New Year's Day)
Urban air quality status
22 cities, including Beijing, are slightly polluted.
Slightly polluted Mudanjiang Guilin Chongqing Luzhou Xi 'an
You Zhanjiang Lhasa
Okay, 57 other cities
Pollution index range and air quality
Pollution index air quality
0-50 excellent
5 1- 100 beam
10 1- 150 slightly polluted.
Pollution index air quality
15 1-200 light pollution
20 1-300 Moderate and Moderately Heavy Pollution
Heavy pollution greater than 300
Zhanjiang is the freshest.
Mudanjiang is the worst.
According to the data released by the Ministry of Environmental Protection, the air quality in Lhasa was the best yesterday, reaching 1, with a pollution index of only 22, followed by Zhanjiang with a pollution index of 49.
According to the statistics of the Ministry of Environmental Protection, in the last 30 days, Zhanjiang has the most days with 1. It can be said that Zhanjiang is the city with the best air.
Among the 27 cities with air pollution, Mudanjiang had the worst air quality yesterday, with a pollution index of 192, followed by Xi 'an and Luzhou, with pollution indexes of 170 and 158 respectively.
In addition, monitoring data show that the air quality in Beijing has been declining since New Year's Eve.
The reporter noted that on New Year's Eve, Beijing's air pollution index was 58, and the air quality was good. On New Year's Day, Beijing's air pollution index rose to 83, and the air quality was still good. On New Year's Day, yesterday, the air pollution index has risen to 1 165438, and the air quality is slightly polluted.
According to the air quality monitoring forecast of Beijing Environmental Protection Monitoring Center, today, the air pollution index in Beijing will be between 95- 1 15.
analyse
Air pollution caused by fireworks and firecrackers
The reporter noted that in the monitoring city data released by the Ministry of Environmental Protection, from New Year's Eve to now, the primary pollutants in most cities are sulfur dioxide and inhalable particulate matter.
It is understood that this has a lot to do with people setting off a lot of fireworks and firecrackers during the Spring Festival holiday.
The monitoring results of Wuhan Environmental Monitoring Center Station show that the air pollution index in the urban area of the city is 197 from New Year's Eve 12 to February 3 12, and the air quality is slightly polluted. Compared with the air pollution index of 69 a day ago, it is far from it.
Wei Hongming, deputy stationmaster of Wuhan Environmental Monitoring Center, said that the main reason for the sharp drop in air quality was the setting off of fireworks and firecrackers. When fireworks explode, they will release a lot of smoke and sulfur dioxide.
The reporter learned that from New Year's Eve to New Year's Day, large-scale and staged fireworks and firecrackers were set off in many cities, and the pollutants in the air increased rapidly, which directly led to the decline of air quality. Especially on New Year's Eve 19:00-22:00 and the first day of the first month of the first month, the monitoring results in many cities show that the air quality is the worst at this time, and this time is the time when firecrackers are most concentrated.
In addition, with the increase of people's activities of visiting relatives and friends, the use of vehicles on the first day of the first month of the first month has increased significantly, which has also become an important factor in air pollution in many cities yesterday.
affect
Toxic and harmful gases are invisible "killers"
It is understood that fireworks will produce gases such as sulfur dioxide, nitric oxide and nitrogen dioxide. These poisonous and harmful gases are invisible "killers" When the smoke is filled, these gases will do some damage to the respiratory system and nervous system, stimulate the eyes, and some will contribute to the occurrence or development of some chronic diseases.
When the concentration of harmful substances such as sulfur dioxide in the air exceeds the allowable value, it will stimulate respiratory mucosa, damage lung tissue, and cause or induce bronchitis, tracheitis, pneumonia, emphysema and other diseases. In addition, some poisons combine with hemoglobin in the human body, which is easy to cause hypoxia and poisoning symptoms.
It is worth noting that a few days before the 20 1 1 Spring Festival holiday, many cities were sunny, which easily caused secondary air pollution.
The nitrogen oxides produced by the combustion of fireworks and firecrackers will undergo photochemical reaction after being irradiated by sunlight and ultraviolet rays, resulting in photochemical smog, which is a toxic secondary pollutant that will irritate people's eyes and nasal mucosa, thus causing pathological changes and headaches.
The staff of Beijing Environmental Monitoring Center said that with the weakening of fireworks and firecrackers in the future, it is expected that the air quality in Beijing will improve in the next few days. Text/Reporter Wang Nan