Observation And Research Of Air Pollution Near Ground By Small PM_2.5 Sensors Carried By Drones

The impact of pollution incidents in China has expanded from a single city to an urban agglomeration,and observational studies on fine particulate matter(PM2.5)near the ground have become particularly important.In order to evaluate the observation of small sensor on PM2.5 in the atmosphere,and to explore the feasibility of carrying small sensors on regional pollution research,laboratory calibration and the data of PM2.5 data along with the observation data of national environmental monitoring station and full scattering data were analyzed.We also used the small PM2.5 sensor equipped with an drone to observe the near ground PM2.5 in Shahe City and Rizhao City.Summarizes the primary coverage which this article studies as follows to show:(1)The results showed that when the particle size was 400 nm,the standard concentration of NaCl produced by aerosol generator was the lowest,Aquadag was centered,and psl was the highest.The observed deviation of the PM2.5 sensor for Aquadag was the largest,psl was centered,and NaCl was the smallest.(2)The observation results of PM2.5 sensors were completely consistent with the data trend of the National Control Station of the Olympic Sports Center,with the correlation coefficient of 0.9 in the summer 2018.The higher the PM2.5 concentration,the higher the PM2.5 sensor observation was.The observations of the PM2.5 sensor in the spring of 2019 were consistent with the trend of the full scattering data,and the correlation coefficient was greater than 0.93,which were significantly correlated.It turned out that the main factor affecting the observation of the PM2.5 sensor was the scattering intensity of the particles received by the sensor(3)The analysis of emission sources in Lanshan District of Rizhao City found that the industrial sources in Lanshan District were mainly rubber and plastic products enterprises.The fuels of industrial enterprises were mainly coke and coal,which the consumption was 5.259 million tons and 4.685 million tons respectively,accounting for 99.2%and 35.9%of the city's consumption respectively.Coal was the main fuel consumed by a single small boiler.The main coal consumption industry was industrial production,which the coal consumption was 5544.8 tons,accounting for 99.6%of the total fuel consumption.The total pollutant discharge of the Rizhao Steel Holding Group in Lanshan District is 9372.42 t/a for soot,10857.32 t/a for sulfur dioxide,and 29864.43 t/a for nitrogen oxides.(4)The PM2.5 sensor equipped with a drone was used to observe the PM2.5 concentration below 300 m in the ground.It was found that the concentration of PM2.5 at glass factory was about 40 ?g m-3 higher than that of the ordinary village at the same height.The highest value of PM2.5 at the same place appeared in the morning 8:40-9:15 morning.The concentration of PM2.5 decreased during the period of 9:30-11:10,and the lowest concentration of PM2.5 appeared during the period of 19:20-19:40 at night.The vertical profile study found that the concentration of PM2.5 in different locations showed a trend of increasing-decreasing-increasing-decreasing,but the height of the specific peak turning point was different in different regions and different time.The route observation found that the concentration of PM2.5 was different at different times in the same place,which was related to the reduction of production and meteorological conditions.In addition,large-scale sweep observations of Shandong Iron and Steel Group in Lanshan District of Rizhao City could accurately locate the main exhaust gas positions of the steel plant.