| Based on the analysis of the characteristics and sources of the pollutants in the air-conditioner filter dust in the different floors of high-rise buildings（1st,10 th,20th and30th）.We evaluate the health risk of PAHs exposure to the living population,then select a hotel in the city,we studied the temporal variation of n-alkanes in atmospheric particles with different sizes through the multi-stage atmospheric sampler under the fog and haze weather.Results shows:（1）the concentration of PAHs in the air-conditioner filter dust was 1.27 92.5 μg·g-1,the average value was 25.9 μg·g-1.The concentration of PAHs from 10 th was range from4.45 to 92.5 μg·g-1(mean was 35.3 μg·g-1),higher than other floors（p ≤ 0.05）,followed by 1st(6.74 35.6 μg·g-1,17.8 μg·g-1),30th(1.22 39.5 μg·g-1,16.4 μg·g-1),the lowest was 20th(1.69 29.9 μg·g-1,9.75 μg·g-1).The concentration variation of the living room and bedroom was not obvious（p ≥ 0.05）.Living room was range from 1.22 to 39.5μg·g-1(26.7 μg·g-1),which is similar to bedroom(1.69 92.5 μg·g-1,25.7 μg·g-1).Principal component analysis（PCA）shows that the source of PAHs was mainly from oil and other fossil fuels.In addition,we used PAHs from air-conditioner filter dust to assess the health risk,results shows that children’s dietary exposure value was higher than adults,which respectively was 1.06 ± 2.12 × 10-6(4.95 × 10-9 1.15 × 10-5)and1.22 ± 2.52 × 10-6(5.72 × 10-9 1.34× 10-5);and the risk value of skin exposure and respiratory exposure was higher in adults than children,the skin exposure values of adults and children respectively was 3.36 ± 6.91 × 10-7(1.57 × 10-9 3.66 × 10-6)and4.66 ± 9.58 × 10-6(2.18 × 10-9 5.08 × 10-5),respiratory exposure values respectively was 2.03 ± 4.18 × 10-8(9.49 × 10-11 2.21 × 10-7)and 9.67 ± 19.9 × 10-7(4.53 × 10-10 1.06 × 10-6).（2）The concentration of n-alkanes was range from 48 to 5800 μg·g-1,the average value was 710 μg·g-1,the concentration of PAHs from 10 th was range from 370 to 1500μg·g-1(950 μg·g-1),higher than the other floors（p ≤ 0.05）,followed by 1st(370 1500μg·g-1,720 μg·g-1),30th(230 1100 μg·g-1,540 μg·g-1),20th(200 1100 μg·g-1,530μg·g-1).The concentration change of the living room and bedroom was not obvious（p ≥0.05）,bedroom was 100 5800 μg·g-1(730 μg·g-1),which is similar to living room(48 2600 μg·g-1,680 μg·g-1).The results shows that n-alkanes in household air-conditioner dust filter was mainly from combustion of fossil fuel,natural emissionsand solid biomass fuels.（3）The ∑27AK from indoor/outdoor atmospheric particulate matter was range from120 to 10700 ng·m-3,the average concentration was 820 ng·m-3.The ∑ 27 AK from indoor atmospheric particulate matter was range from 174 to 10700 ng·m-3（1130ng·m-3）,significantly higher than outdoor（120 2000 ng·m-3,510 ng·m-3）.In addition,the ∑27AK from atmospheric particles was different in different particle size.The concentration of particle size in the range of 4.7 5.8 μm was significantly higher than other particle size（p ≤ 0.05）,which contributed the most to the atmospheric particulate matter concentration（26.67%）,followed by 2.1 3.3 μm（13.30%）,5.8 9 μm（12.06%）,3.3 4.7 μm（10.16%）,≥ 9 μm（9.71%）,0.651.1 μm（9.37%）and 1.1 2.1 μm（9.32%）.We analyzed the pollutant concentration characteristics indoor and outdoor found 2 peaks of the day were in 8:00 12:00 am and 16:00 20:00 pm,which coincided with the morning and evening rush hour traffic.Based on the mass concentration of n-alkanes,calculated the GMD value and GSD value of the n-alkanes.The results shows that the average GMD value of indoor and outdoor particulate n-alkanes respectively was 2.65 ± 0.27 μm and 2.84 ± 0.07 μm.The average GSD value of outdoor and indoor particulate n-alkanes respectively was 2.84 ± 0.07 μm and 2.71 ±0.34 μm. |
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