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What are the requirements for monitoring points for dust monitoring equipment?
With the rapid development of our country’s economy, the environmental quality has undergone tremendous changes, especially the pollution of PM2.5 fine particles in the atmosphere has become a major environmental problem, seriously endangering human health, and the intensification of severe weather has also caused the public And attention. The renovation work is urgent, and we strive to achieve one-stop supervision of construction dust management from the source to the end through the adoption of video surveillance, online dust monitoring system full coverage measures for all construction and demolition sites, and the use of informationized supervision methods. So what are the requirements for monitoring points when installing dust monitoring equipment? 1. Setting basis: According to the scale and nature of the project, the complexity of the terrain, the layout of pollution sources and the environmental air protection goals, the number of monitoring points should be considered comprehensively. 2. Number of monitoring points: For the first-level evaluation items, the monitoring points should include representative atmospheric protection targets within the evaluation scope, and no less than 10 points; for the second-level evaluation items, the monitoring points should include the evaluation scope . There are no less than 6 representative environmental air protection targets. For areas with complex terrain, large differences in the spatial distribution of pollution, and many environmental air protection indicators, the number of monitoring points can be appropriately increased; three-level evaluation items: there are conventional monitoring points within the evaluation scope, or there are monitoring data for the past three years within the evaluation scope , The validity of the monitoring data meets the relevant provisions of the guidelines. When the project evaluation can be met, the current status monitoring may not be possible, otherwise 2 to 4 monitoring points should be set up. If there are no other pollutants within the assessment scope that emit pollutants with the same characteristics, the monitoring points can be appropriately reduced. 3. For highways, railways and other projects, select representative environmental air protection indicators and establish monitoring points within the assessment scope of each major concentrated emission source (such as service areas, stations and other air pollution sources) . 4. Urban road projects may not be restricted by the number of monitoring points mentioned above. According to the road layout and traffic conditions, combined with the distribution of environmental air protection indicators, select representative environmental air protection indicators, and establish online dust monitoring equipment for monitoring. Principle of monitoring points for dust monitoring equipment: The layout of monitoring points should be as comprehensive, objective and true as possible, reflecting the ambient air quality within the assessment range. According to the different evaluation levels of the project and the layout of pollution sources, the layout of monitoring points should follow the following principles. (1) First-level evaluation items① Take the seasonal dominant wind direction during the monitoring period as the axis, and the upwind direction is 0O, respectively at 0O, 45O, 90O, 135O, 180O, 225O, 70O and At least one monitoring point is set in the direction of 315O, and one or three monitoring points are densely set in the leeward direction of the central point (or main direction). Emission source) at different distances. Specific monitoring points can be adjusted according to local terrain conditions, wind frequency distribution characteristics, environmental function areas and ambient air protection target locations. Each monitoring point should be representative, and the environmental monitoring value should reflect the environmental quality of each environmental air-sensitive area and each environmental functional area, as well as the environmental quality of the high-concentration area expected to be affected by the project. ②The monitoring points of each monitoring period in the ambient air sensitive area should be overlapped. During the monitoring period, according to the prevailing wind direction in each season, the monitoring points in the high concentration area expected to be affected by the project will be adjusted. (2) Secondary evaluation items(1) With the prevailing wind direction during the monitoring period as the axis and the upwind direction as the center, at least one is set in the wind direction, wind direction, wind speed, wind direction, wind speed, etc. Monitoring points, increase the number of wind down points. The specific monitoring point requirements are the same as above. ②When the second phase of monitoring is needed, the monitoring points should be adjusted according to the dominant wind direction in each season during the monitoring period, which is the same as the first-level evaluation item. (3) Three-level evaluation project(1) During the monitoring period, the seasonal wind direction is the main one, and the upwind wind direction shall prevail. At least one monitoring point shall be set up with the directions about 2, 2, 4, 3. And increase the number of wind downwind points. The requirements for each monitoring point are the same as above. ②If there are routine monitoring points within the evaluation scope, monitoring cannot be arranged. (4) Urban road evaluation project. The urban road isolation line source project should select representative environmental air protection targets, and set up monitoring points within the scope of the project evaluation. The layout of monitoring points should also be combined with the vertical spatial distribution of sensitive points. (5) Environmental conditions around the monitoring point. It shall comply with relevant environmental monitoring technical specifications. ①The space around the monitoring point should be open, and the angle between the horizontal line of the sampling port and the height of the surrounding buildings should be less than 30o;②There should be 2700 sampling and capturing spaces around the monitoring point, which will not affect the airflow;③Avoid the influence of local pollution sources. In principle, there is no local emission source within 20 meters;④Avoid trees and buildings with strong adsorption capacity. Generally, there are no green trees, shrubs, etc. within 15-20 meters.
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