Temporal And Spatial Variation Characteristics Of PM_2.5 And PM₁₀ Concentrations In Urumqi

In order to more understand the temporal and spatial characteristics of PM_2.5.5 and PM₁₀0 concentrations in Urumqi,using the PM concentration data and meteorological data from March 2014 to February 2017,analyzed the PM_2.5,PM₁₀0 concentrations in time and space of Urumqi,established a regression model to predict the concentration of particulate matter,in order to provide a theoretical reference for further discussion of particulate concentrations in Urumqi.The main research results are:?1?2014 to 2016 each year March to November,the concentration of particulate matter gradually decreased with the increase of the year,and the concentration of particulate matter from December to next year February was basically increasing yearly,and March to November,the pollution level of particulate matter in light pollution days,decreased year by year,from December to February of the following year increased year by year.?2?In space,both the average annual concentration and the seasonal concentration of PM_2.5.5 and PM₁₀0 show that the concentration of both is high in the northwest and low in the southeast.The average annual concentration of PM_2.5.5 was positively correlated with the year,but its concentration appeared negatively correlated with the year of the high value zone.The annual average concentration of PM₁₀0 and its concentration range of high value areas,which does not change significantly with the increase of the time.?3?Inthetime,theconcentrationsofPM_2.5andPM₁₀showed winter>spring>autumn>summer,in winter there was a positive correlation between PM_2.5.5 concentration and the year,and there was no relationship in other seasons.The maximum range of high PM₁₀0 concentration occurs in winter,In winter,there was a positive correlation between the maximum and minimum value of PM₁₀0 concentration and the years,the variation regularity of the regions in the low value in different seasons is inconsistent.At the same time,the average concentrations of PM_2.5.5 and PM₁₀0 in winter are about 80%and 55%higher than those in summer.The highest and lowest monthly average concentrations of PM_2.5.5 and PM₁₀0 in Urumqi occur in January and July of each year,the monthly average concentrations of PM_2.5.5 and PM₁₀0 vary greatly in different months.Among them,the highest monthly average concentration of PM_2.5.5 is 9.5 times the lowest value,and the highest monthly average concentration of PM₁₀0 is 4.2 times the lowest value.The daily average hourly concentration change curve of PM_2.5.5 and PM₁₀0 showed a double peak and double valley type.the two valley values appear at 7 o'clock and 17o'clock respectively.In winter,the peak time of PM_2.5.5 and PM₁₀0 concentrations occurs at 10 o'clock and 21 o'clock,and the valley time was 5 o'clock and 14 o'clock.?4?The correlation of PM_2.5.5 and PM₁₀0 concentrations with temperature,humidity and wind speed was very significant,the correlation between PM_2.5.5 concentration and temperature,humidity,and wind speed is greater than PM₁₀0 concentration.In the regression model of PM_2.5.5 and PM₁₀0 concentration and temperature,the prediction effect of the two-time model is the best and the more simple and practical.