What is the air pollution index of major cities in China after the New Year?

Yesterday, with people going out to visit relatives and friends, the number of vehicles on the road increased, and fireworks and firecrackers continued to be set off, the air quality in many cities across the country was polluted.

according to the monitoring data of the Ministry of environmental protection, on the second day of the lunar new year, among the 86 cities monitored in China, 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 across the country

According to the monitoring data of the Ministry of Environmental Protection, the air quality of 22 cities in the air quality daily of 86 cities was slightly polluted yesterday, including Beijing.

in addition, there are five cities, including Mudanjiang, which are lightly polluted.

The reporter noted that among the monitored cities, only two cities have excellent air quality, namely Lhasa and Zhanjiang.

except for the above cities, the air quality in other monitored cities is good.

The air pollution index in Beijing yesterday was 111, and the primary pollutant was inhalable particulate matter, which was a slight pollution.

according to the monitoring data of Beijing Environmental Protection Monitoring Center, the areas with the worst air quality in Beijing on that day were Huangcun Town in Daxing and Liangxiang Town in Fangshan District, with the pollution index of 13, 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 p>86 cities (on the second day of New Year's Day)

Air quality in cities

Slightly polluted in 22 cities including Beijing

Slightly polluted in Mudanjiang, Guilin, Chongqing, Luzhou, Xi 'an

Excellent in Zhanjiang, Lhasa

Excellent in other 57 cities

Pollution index range and air quality

Pollution index air quality

-5 excellent < p. Pollution

pollution index air quality

151-2 light pollution

21-3 moderate and moderate heavy pollution

more than 3 heavy pollution

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 Grade 1, with pollution.

according to the statistics of the Ministry of environmental protection, in the last 3 days, Zhanjiang has the most first-class days, so 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 17 and 158 respectively.

In addition, the monitoring data show that the air quality in Beijing has been declining since the New Year's Eve.

The reporter noticed that on New Year's Eve, the air pollution index in Beijing was 58, and the air quality was good. On the first day of New Year's Eve, the air pollution index in Beijing rose to 83, and the air quality was still good. On the second day of New Year's Eve, yesterday, the air pollution index had risen to 111, and the air quality was slightly polluted.

According to the air quality monitoring forecast of Beijing Environmental Protection Monitoring Center, the air pollution index in Beijing will be between 95 and 115 today.

Analysis

Air pollution caused by fireworks and firecrackers

The reporter noted that in the monitored city data released by the Ministry of Environmental Protection, from the New Year's Eve to the present, the primary pollutants in most cities are sulfur dioxide and inhalable particles.

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 from 12: on New Year's Eve to 12: on February 3, the air pollution index in the urban area of this city is 197, 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. 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, fireworks and firecrackers were set off in large areas and stages in many cities, and the pollutants in the air increased rapidly and greatly, which directly led to the decline of air quality. Especially from 19: to 22: on New Year's Eve and from : to 2: on the first day 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 increased significantly on the first day of the first lunar month, which also became an important factor of air pollution in many cities yesterday.

Influence

Toxic and harmful gases are invisible "killers"

It is understood that setting off fireworks will produce gases such as sulfur dioxide, nitric oxide and nitrogen dioxide, which are invisible "killers". When the smoke is filled, these gases have certain damage to the respiratory system and nervous system, and also stimulate the eyes, and some will contribute to the occurrence or development of some chronic diseases.

When the concentration of sulfur dioxide and other harmful substances in the air exceeds the allowable value, it will stimulate the respiratory mucosa, damage the 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 in the first few days of the Spring Festival holiday in 211, many cities were sunny, which easily caused secondary air pollution.

The nitrogen oxides generated by the combustion of fireworks and firecrackers will undergo photochemical reaction after being irradiated by sunlight and ultraviolet rays, resulting in a photochemical smog, which is a toxic secondary pollutant and 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