Three days later, the cold wind came to Sichuan Basin, and the heavily polluted weather is expected to improve on the night of the 29th.

Near the end of the year, Chengdu people’s wish for the arrival of cold air is even more urgent. At 0: 00 on December 24th, Chengdu launched the first orange warning of heavy pollution this year. There is no wind, no rain, and pollutants are difficult to disperse in calm weather. Chengdu people are experiencing the first heavy pollution weather since the winter of this year.

On the afternoon of December 25th, an emergency meeting on heavy polluted weather in Chengdu was held in Chengdu Environmental Protection Bureau. The meeting informed the media about the prediction and prevention of air pollution in the whole province and Chengdu. Experts attending the meeting said that the regional pollution situation will still be maintained in the basin in the next few days. "This grim situation is expected to be improved on the night of the 29 th."

Pollution prediction

Regional pollution lasts for 29 days or improves.

On the evening of 24th, emergency headquarters, a heavily polluted weather city in Chengdu, called experts from the Municipal Meteorological Bureau, the Municipal Environmental Monitoring Center and the Municipal Environmental Protection Science Research Institute for emergency consultation, analyzed and discussed the causes and trends of the pollution process, and deployed emergency measures.

Experts attending the meeting said that the regional pollution situation will still be maintained in the basin in the next few days. "This grim situation is expected to improve on the night of the 29th. From 25th to 28th, the basin was dominated by cloudy or cloudy weather with no obvious precipitation. On 26th, due to the influence of the south branch trough, a weak north wind entered the basin, and the meteorological diffusion conditions improved slightly, but the overall meteorological diffusion conditions were poor. Around the 29 th, there was precipitation under the influence of weak cold air, and the meteorological diffusion conditions were moderate, and then gradually deteriorated. "

To this end, experts suggest that the province increase the intensity of joint prevention and control; Strengthen traffic guidance on key sections of the city, cancel roadside parking, ensure smooth roads, and strengthen the control of high-emission vehicles such as diesel trucks, slag trucks and engineering vehicles; In particular, in view of the rapid increase of pollutant concentration at night, we should strengthen the investigation and punishment of biomass burning, garbage burning in the open air and barbecue in the open air, and make full use of meteorological conditions to implement artificial precipitation enhancement as much as possible.

Zhang Jun, executive deputy director of Chengdu Environmental Protection Supervision Office and director of Chengdu Environmental Protection Bureau, demanded that the consultation should be encrypted in the near future, and the inspection and supervision of the implementation of emergency plan measures should be intensified, and the assessment should be strictly strengthened and publicity should be strengthened to guide and remind the public to do a good job in health protection.

After the meeting, Chengdu Atmospheric Office and Inspector’s Office went to Wuhou District, chenghua district, Shuangliu District, Tianfu New District, High-tech Zone and other areas to carry out surprise inspections on dust pollution prevention at construction sites, limited production and production of key enterprises, open-air barbecue control and so on, and promptly corrected and handed over to investigate and deal with atmospheric environmental violations.

Assault night check

Many subway sites and open-air barbecues were ordered to rectify.

On the night of December 24th, the soldiers of Chengdu Environmental Protection Bureau went to Shuangliu District, Tianfu New District, Wuhou District and other places in two ways to carry out inspections on key projects and key enterprises and conduct surprise inspections on the implementation of emergency plans and measures for heavy polluted weather.

A group of inspectors first came to CSG, located in the second section of Huanglong Avenue in Shuangliu District. On-site inspection found that three production lines of CSG had implemented the emergency plan for heavy polluted weather, which reduced production and controlled the concentration of nitrogen oxides below 300 mg/L. However, the road surface dust at the entrance and exit of the storage area for purchased broken glass was serious.

The inspector group asked the factory to do a good job of road cleaning immediately and take preventive measures. The inspector team then found a number of open-air barbecue stalls downstairs in Guangming City Community and Muhe South Road Community on Huafu Avenue, and immediately instructed the territory to supervise and rectify the open-air barbecue stalls.

At the construction site of the 11th civil engineering bid of Metro Line 5, the inspector group found that the management of the slag pool on the construction site was not standardized, and there was leakage of slag on the road surface. In particular, the coagulation mortar mixing station was not closed as required, resulting in serious dust pollution. After on-site inspection, the PM10 value here has exceeded 1000, and the inspector group asked the construction unit to take dust-proof measures immediately and hang dust-proof curtain cloth. The inspector team handed over the case to the Municipal Construction Committee for investigation and urged the rectification to be in place.

Inspector Group II came to the construction site of Bid Section 5 of Metro Line 9 in Jitou District of Wuhou District to check the air pollution prevention measures at the site, and found that some dust suppression equipment was out of order and environmental protection facilities were not operating normally. At Jijiu Road, the "scattered and polluted" enterprises that have been ordered to suspend business were raided, and no illegal production situation of related enterprises was found.

Expert interpretation

Chengdu people need to work together if the weather doesn’t help.

From December 24th, Chengdu citizens can enjoy free public transportation with Tianfu Tongka, which is one of the convenience measures during the orange warning period of heavy polluted weather. It is suggested that citizens travel by bus as much as possible, and enterprises, construction sites and open-air barbecues are restricted or prohibited. Everyone’s efforts will reduce the burden of air pollution.

"The Sichuan Basin is low-lying and surrounded by mountains. In winter, cold air is not easy to reach the inside, and the basin is warm, but it is not conducive to the spread of pollutants. There has been no precipitation since the 18th, and even the wind is not felt. Compared with the influence of nature, the strength of human beings is very small. In the case that meteorological and geographical conditions can’t help, Chengdu people need to work together to protect the environment and continue to reduce emissions. " Yi Bo, deputy director and spokesperson of Chengdu Environmental Protection Bureau, said that everyone living in Chengdu is an emission unit. In addition to using scientific and technological means to control haze, everyone’s efforts are also the driving force to "dig" the pollution index one by one.

Focus question and answer

Focus 1

Why not artificially increase rainfall?

Some citizens have asked why we can’t directly implement artificial precipitation enhancement, but need to wait for the arrival of cold air. In this regard, Chen Hong, director of the Chengdu Meteorological Observatory, explained that although science and technology are developed now, for the laws of nature, people can’t interfere with large-scale things, but only fine-tune or induce them. "Taking artificial precipitation enhancement as an example, in the current situation of clear skies and no water vapor, it is equal to no play. However, if there are precipitation conditions, precipitation enhancement may make the amount of light rain a little larger. " Chen Hong said.

Focus 2

Has the pollution decreased compared with the same period last year?

According to Andy, a senior engineer of the Provincial Environmental Monitoring Center, the situation of this heavily polluted weather is not the same as that of the same period last year. "From 17: 00 to 21: 00 on December 20 last year, it took only 15 hours for the air quality to change from good to heavy pollution. This year, it took 96 hours from good to heavy pollution on December 17. "

"When the cold and hot air in the basin can’t be exchanged, the accumulation process from good to severe pollution takes longer. This shows that basic domestic pollution will still occur, but we produce less and less pollutants. " Andy said.

This group of manuscripts is reported by Huaxi Dushi Bao-cover journalist Lai Fangjie and intern Wu Ming.