Director of Atmospheric Room of Environmental Monitoring Station： The monitoring items are more detailed and the forecast will be able to personal tailor.

Staff in Langfang City, Hebei Province are checking the working conditions of automatic air monitoring and sampling equipment. Xinhua news agency

When the heating season is coming, people are beginning to worry about the outdoor air quality while enjoying the indoor warmth. Now, as long as you open the mobile APP, you can view the monitoring data in real time, and the concentration and changing trend of pollutants such as PM2.5 can be seen at a glance. Air quality monitoring is an important line of defense to defend the blue sky, and it is also the basis and foundation of governance. Data quality affects people’s hearts. How to monitor? How to monitor air quality this winter? How to ensure that the data is true and accurate?

Monitor the three-dimensional layout of the network and strive to fully control the pollution factors.

In the early morning of November, after the baptism of the north wind, Beijing swept away the smog of the previous days, and the blue sky was like washing. The concentration of PM2.5 in most parts of the city was below 20 μ g/m 3.

"It is more obvious where the concentration exceeds the standard in this fine weather." Jia Fei, deputy director of the Information Center of Tongzhou District Environmental Protection Bureau in Beijing, checked the air pollutant monitoring APP in his mobile phone as soon as he went to work. The screen not only displays the average index of air pollutants in Tongzhou in real time, but also lists the situation of streets and towns respectively. "If the data at any point or adjacent points is abnormal, it means that there may be a source of pollution that is being smuggled there, and the relevant person in charge will immediately notify the grid staff in the jurisdiction to go to the site for inspection." Jia Fei said.

The reporter walked into Huguang Community, Taihu Town, Tongzhou, and saw a camera-sized device hanging from a high position such as a monitoring pole. Jia Fei explained that this is the simple air quality monitoring station, which uses optical scattering method to automatically measure the concentration of particulate matter in the air, and realizes real-time transmission of air quality information through wireless transmission module, and finally converts it into air quality data that everyone sees on mobile terminals such as mobile phones and computers.

In 2012, the new Ambient Air Quality Standard was implemented, which clearly defined six key air quality monitoring indicators: sulfur dioxide, nitrogen dioxide, inhalable particulate matter (PM10), fine particulate matter (PM2.5), carbon monoxide and ozone. Since then, a series of supporting technical specifications for environmental air quality monitoring have been issued. "According to the requirements of the specification, air quality monitoring is divided into automatic monitoring and manual monitoring. The automatic monitoring method has high measurement accuracy and strong timeliness, and it is the mainstream method at home and abroad." Tang Guigang, director of the Atmospheric Room of China National Environmental Monitoring Center, said that up to now, there are 3,907 air quality monitoring points in China, including 1,436 national control stations, an increase of 16% over 2015.

Specific to Tongzhou District, in addition to 480 simple monitoring stations, there is also a full station and 18 single stations. Among them, Quanxiang Station is located in the south of the Olympic Park Stadium, which is a closed station building with an area of about 15 square meters. There is equipment outside the house to collect air, and there are monitoring and analysis instruments for six major pollutants inside. The 18 single stations mainly monitor PM2.5, of which the data of some stations are used to understand the transport of pollutants between regions, and the other part is used for territorial assessment. All kinds of monitoring stations upload data every 5 minutes, generate a pollutant distribution map every 10 minutes, and analyze the possible changing trend in the future.

Not limited to six key indicators, relevant departments have laid down "tight encirclement" for various types of air pollutants. At present, China is building an all-round three-dimensional supervision network, including on-line monitoring of catering fumes, monitoring system of industrial pollution sources, remote sensing monitoring system of stationary motor vehicle exhaust, and monitoring and management system of dust in construction sites. As the monitoring network becomes more and more dense, the research and analysis of influencing factors on air quality will be more and more in-depth.

The monitoring project is more detailed, and the air quality forecast will be able to personal tailor.

While doing basic monitoring, the monitoring system is also developing in a more refined and targeted direction. Tang Guigang introduced that on the basis of state-controlled air monitoring stations, China has carried out special monitoring with different characteristics in different regions. For example, in order to study the impact of dust weather on the atmospheric environment, 78 dust monitoring points were set up in the inland areas of North China, Northeast China and Northwest China, and the total suspended particulate matter (TSP) index was increased. In order to understand the situation of acid rain in cities, more than 950 acid rain monitoring points have been set up, which mainly monitor the pH value, conductivity and concentration of 9 ions such as sulfate, nitrate, fluoride and potassium in precipitation, so as to fully reflect the acidity of precipitation.

In order to actively cope with the heavily polluted weather in Beijing-Tianjin-Hebei and its surrounding areas, and accurately judge the causes of pollution and the effects of measures, in recent years, 38 observation stations of atmospheric particulate components (components) have been set up in Beijing-Tianjin-Hebei and its surrounding "2+26" cities, and 36 indicators such as water-soluble particulate components, carbon components and elemental components have been monitored. In order to cope with the problems of intensified atmospheric photochemical reaction and increased ozone concentration in some cities in recent years, pilot monitoring of ozone precursors (some components of volatile organic compounds) was carried out in 78 cities in Beijing, Tianjin and Hebei, the surrounding areas, the Yangtze River Delta and the Pearl River Delta, to study the types, concentration levels and changing laws of pollutants.

Although professional, the air quality monitoring system is not closed, but open to the public and interact with the society. For example, if the air quality is found to be abnormal, the public can report it through the mobile APP at any time. After receiving the alarm, the law enforcement officers in towns and streets will check the area near the site at the first time and start the law enforcement and governance work in a targeted manner.

Tang Guigang told reporters that in recent years, relevant departments have thought of many ways to improve the level of information services. First of all, adhere to timeliness and respond to public concerns in a timely manner. On the basis of real-time release of national air quality, air quality forecast information and health tips will be released 3-5 days in advance, and an expert response system will be established to release real information for hot issues of public concern at the first time to solve doubts and doubts. In addition, air quality information is jointly released through official website, Weibo, WeChat, APP and other channels, which makes it more convenient for the public to inquire and receive information.

"The data can be measured, but also let the people see and use it well. In the future, while releasing air quality forecast and early warning information of heavy pollution weather, we will make suggestions for the public’s travel and health and realize the personal tailor of air quality forecast. " Tang Guigang said.

There are many tasks in monitoring the war haze this winter, and multiple checkpoints are set up to ensure that the data is true, accurate and complete.

Monitoring is an important basis for the prevention and control of air pollution. This winter, each region, in combination with its own characteristics, strives to make the monitoring precise and practical, so as to better serve the blue sky defense war.

Improving forecasting ability and forecasting earlier is the key to effectively deal with heavy pollution. According to the plan of air pollution prevention and control in autumn and winter in three key areas issued by the Ministry of Ecology and Environment, before the end of 2018, the air quality forecasting center in the Yangtze River Delta region should strive to achieve the 7-10-day forecasting ability, and the provincial forecasting center should basically achieve the 7-day forecasting ability in cities; The 7-day forecast ability should be basically realized in Fenwei Plain.

In view of the large amount of dust fall in autumn and winter in Fenwei area, the Ministry of Ecology and Environment requires all cities, districts and counties in the plain to set up dust fall monitoring points, do a good job in data quality control, and submit dust fall monitoring data to China Environmental Monitoring Center every month. Before the end of the year, it is necessary to start the manual monitoring of the national atmospheric particulate matter composition network in Fenwei Plain. At the same time, local environmental protection departments are encouraged to organize particulate matter composition monitoring and photochemical monitoring within their administrative areas according to actual conditions, and realize data networking with the national atmospheric particulate matter composition and photochemical monitoring network platform.

The pressure of transportation structure adjustment in Beijing, Tianjin and Hebei is huge, and it is extremely urgent to monitor the air quality in autumn and winter in the area related to pollution prevention and control of motor vehicles, especially heavy vehicles. According to reports, the Beijing-Tianjin-Hebei region is building an integrated monitoring system for motor vehicles. The Ministry of Ecology and Environment requires that before the end of the year, cities in Beijing, Tianjin and Hebei should complete the construction of about 10 sets of fixed vertical remote sensing monitoring equipment and about 2 sets of mobile remote sensing monitoring equipment, and all provinces (cities) should complete the construction of laboratory information system platform for motor vehicle emission, forming a three-level networking system for national, provincial and municipal remote sensing monitoring and periodic emission inspection data, so as to realize real-time and stable transmission of monitoring data.

The monitoring ability is constantly improved, the monitoring methods are increasingly innovative, and the monitoring methods are accelerated to expand. However, data quality is the vitality of monitoring. Only by ensuring that the data is not interfered by human beings, accurate and detailed can it provide the most scientific and reliable basis for haze control.

"We have set detailed operation and maintenance specifications, such as prohibiting non-operation and maintenance supervisors from approaching within 20 meters of the monitoring site, and also developed operation and maintenance APP software to monitor whether the operation and maintenance personnel work according to the specifications in real time." Xu Xiaoyun, deputy director of Tongzhou District Environmental Protection Bureau, told the reporter that this was done to prevent possible interference and ensure the stable operation of the monitoring station.

In order to ensure the authenticity and accuracy of the data, the relevant departments have also taken a series of measures, including reforming the ecological environment monitoring system, improving laws and regulations, actively building a three-level quality control system for national environmental monitoring, and strengthening flight inspection.

For example, the application of three-level quality control system effectively reduces the possibility of fraud. Tang Guigang introduced that in order to ensure accurate data, the existing national quality control platform, regional quality control laboratories and monitoring laboratories constitute a three-level quality control system to realize the traceability and monitoring comparison of various air quality monitoring indicators. All the national control sites have remote quality control systems, which have the functions of modifying traces and giving an abnormal alarm. There are several monitoring points in a city. Under the same weather conditions, the trend of monitoring data at each point should be the same. If the trend of data at a certain point is abnormal compared with other points, the system will immediately "light up the red light" and issue a report to prompt data analysis.

At the same time, ensure real-time data "one point three hair". After the monitoring data are generated at each state-controlled station, the original data are directly transmitted to the city station, provincial station and the platform of China Environmental Monitoring Center, and the same data are obtained at the national, provincial and municipal levels at the same time. The monitoring station conducts online review/recheck of the 24-hour real-time monitoring data of six indicators of all state-controlled stations every day, and will take immediate action if there is any data abnormality in any link.

The relevant person in charge of the Ministry of Ecology and Environment has also constantly stressed that in the future, information disclosure will be intensified, law enforcement will be strictly enforced, and a strong high-pressure shock situation will be formed, and there will be zero tolerance for the falsification of monitoring data to ensure that environmental monitoring data is comprehensive, accurate, objective and true.

(The original title is "Air Quality Monitoring: More detailed forecast of the project will enable personal tailor")