Abstract
To study the carbon components in indoor and outdoor PM2.5, the samples of PM2.5 were collected from Nankai University in December 2015. The contents of eight carbon components were analyzed to use the thermo-optical reflection method. The results indicated that organic carbon (OC) mass concentration was 17.01, 19.48 and 18.92 µg/m3 in outdoor, dormitory and laboratory; elemental carbon (EC) mass concentration was 7.97, 3.56 and 3.53 µg/m3 in outdoor, dormitory and laboratory; and the total carbon aerosol was the proportion of more than 23% of PM2.5 samples. Lower wind speed and higher relative humidity were helpful to the accumulation of PM2.5. The ratio of OC/EC was > 2, and the SOC/OC ratio was > 30%, indicating that SOC was a crucial component indoors and outdoors. About 72% and 85% of the outdoor OC entering dormitory and laboratory environment, and about 59% and 71% of the outdoor EC entering dormitory and laboratory environment. Factor analysis of the eight carbon fractions indicated that the sources of OC and EC in outdoor, dormitory and laboratory is different.
Highlights
To study the carbon components in indoor and outdoor PM2.5, the samples of PM2.5 were collected from Nankai University in December 2015
The indoor P M2.5 and organic carbon (OC) concentrations were considerably higher than those of the outdoor environment during the three days, which indicated that the indoor PM2.5 and OC are produced by indoor sources, such as personal activities and c leaning[21]
The concentration of PM2.5, OC, and elemental carbon (EC) increased on December 08, 14, and 21 mainly due to the heavy haze pollution, higher air relative humidity (93%, 82% and 84%), and lower wind speed (0.8 m/s, 1.6 m/s and 0.7 m/s)
Summary
To study the carbon components in indoor and outdoor PM2.5, the samples of PM2.5 were collected from Nankai University in December 2015. Due to the different environmental conditions and pollution sources in various regions, the total mass fraction of the carbon aerosols in P M2.5 ranges from 10 to 70% 2–7. Research on the carbon aerosol in P M2.5 is popular in the field of international atmospheric a erosol[13,14] Many cities, such as Seoul and Cheju (South Korea)[15], Atlanta (United States)[16], and Chiba (Japan)[17], have conducted relevant studies to obtain the atmospheric particulate concentration level, seasonal characteristics, particle size distribution, and contribution sources of P M2.5 in various regions. The results indicated that biomass burning could be one of the major sources of carbonaceous aerosols in D arjeeling[27]. Unfavorable conditions in dormitory and laboratory environments can harm the health of the occupants
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