Concentration Levels And Exposure Assessment Of Indoor And Outdoor PM In Office Building Of Chongqing

A large number of epidemiological studies have shown that the level ofatmospheric concentration of particulate matter is closely related to the crowd morbidityand mortality. However, there is litter research about the level of concentration ofparticulate matter and exposure assessment in the office building, its human healtheffects, the establishment of the office of air quality standards and the development ofcorrect control strategies need in-depth research to improve indoor air quality, to reducestaff health risk and create a better indoor environment for people.Therefore, this article take the offices in Chongqing as the research object, bymonitoring their indoor and outdoor PM10and PM2.5concentration in spring andsummer, indoor and outdoor concentration levels and their correlation and impact ofdifferent air conditioning to indoor particulate matter concentration were analyzed; Thisarticle proposed a quantitative estimate of the source of emissions of indoor particulatematter model and and examined its accuracy, because it is difficult to monitor thesources of indoor pollution emissions intensity during the experiment; Finally, in thebasis of experimental monitoring, and combination of questionnaires, it evaluated thePM10and PM2.5exposure of the staff in the offices. Then the main conclusions isgiven as follows.1) In the spring, the indoor and outdoor PM2.5daily average concentretions of theoffices were129.8μg/m~3and157.0μg/m~3, the indoor and outdoor PM10dailyaverage concentretions of the offices were147.6μg/m~3and179.6μg/m~3, andoutdoor particulate matter is the main source of the indoor particulate matter.2) In the summer, the outdoor PM10and PM2.5daily average concentration of theoffices were137.8μg/m~3and125.0μg/m~3. Affected by the type of air conditioningmicroenvironment, the indoor PM10and PM2.5daily average concentration of thenon-air-conditioned office was the highest, the mean values were108.3μg/m~3and96.7μg/m~3; The central air conditioning followed, the mean values were96.5μg/m~3and89.1μg/m~3; And the split air-conditioning was the smallest, the mean were83.0μg/m~3and75.9μg/m~3.3) The outdoor PM10concentration in spring and outdoor PM2.5concentration inspring and summer are exceeded the air quality standards for secondary pollution limitvalues of concentration and belong to the moderate level of contamination, and the summer outdoor PM10concentrations exceed the limit value of the first lerel ofconcentration, belongs to the slight pollution level. The outdoor PM10and PM2.5concentration in spring is greater than the corresponding value in summer, this is due tothe difference between outdoor meteorological parameters in spring and summer inChongqing. The PM2.5/PM10ratio of outdoor in spring and summer are respectively0.874and0.907, the outddor atmospheric particulate matter mainly of PM2.5fineparticles.4)On the basis of the dynamic mass balance model and linear regression model, itestablishes a quantitative estimation model of indoor particulate matter pollutionemission intensity. By using this model estimate experimental office, it is founded thatthe PM10and PM2.5estimate concentration were17.8μg/m~3and7.9μg/m~3, thedeviation between estimation results and experimental results are respectively2.3%and6.8%.5)The exposure of office staffs is evaluated the by using microenvironmentparticulate matter exposure assessment methods and human respiratory tract model forradiological protection. It is founded PM10and PM2.5comprehensive exposure andpotential dose relationship exists in spring than in summer; In the spring and summer,PM10and PM2.5potential dose values are greater than the integrated exposure, inspring big28.2%and22.9%respectively the summer big17.5%and14.9%respectively.The deeper the area of human lungs of the person in the office, PM2.5role dose theless.