Table 3 Average winter and summer concentrations for PM2.5 mass and carbonaceous aerosols in 2003 and 2013.
From: Decreasing concentrations of carbonaceous aerosols in China from 2003 to 2013
Annual average concentration (µg m−3) | Decrease in percent* (%) | |||
|---|---|---|---|---|
2013 | 2003 | |||
19 cities | 14 cities | 14 cities# | 14 cities | |
PM2.5 | 103.3 ± 82.3 | 95.6 ± 77.5 | 117.6 | 19 |
TC | 24.1 ± 21.0 | 23.2 ± 20.7 | 32.7 | 29 |
OC | 18.2 ± 17.2 | 17.5 ± 17.4 | 26.0 | 32 |
EC | 5.9 ± 4.6 | 5.6 ± 4.1 | 6.8 | 17 |
POC | 12.4 ± 11.8 | 11.7 ± 10.3 | 15.6 | 25 |
SOC | 5.8 ± 9.5 | 5.8 ± 10.3 | 11.3 | 49 |
OC/EC | 3.1 ± 1.5 | 3.1 ± 1.4 | 4.0 | 23 |
CM,% | 36.4 ± 16.3 | 37.5 ± 17.0 | 41.5 | 10 |
