| Temporal change (μg·m−3·y−1) | |||||||
PM2.5 | Sulfate | Nitrate | Ammonium | OC | EC | Metal | Non-metal | |
2/1999-3/31/2018 | −0.1796 | -.- | -.- | .-. | -.- | -.- | -.- | -.- |
3/17/2005-12/31/2014 | −0.0243 | −0.0473 | −0.0006 | −0.0380 | −0.4952 | −0.0409 | −0.0155 | −0.0152 |
Warm season 2005-2014 | −0.1095 | −0.0179 | −0.0003 | −0.0114 | −0.5080 | −0.0213 | −0.0270 | −0.0058 |
Cold season 2005-2014 | 0.0717 | −0.0964 | −0.0055 | −0.0701 | −0.5722 | −0.5722 | −0.0037 | −0.0307 |
3/17/2005-12/31/2006 | 0.0003 | −0.0026 | −0.0032 | 0.2032 | 0.2620 | 0.2780 | −0.1802 | 0.1529 |
Cold season 2005-2006 | 0.0751 | 0.1467 | 0.1005 | 0.1512 | 1.8366 | 0.2900 | 0.0060 | 0.0488 |
1/1/2007-12/31/2014 | −0.0005 | −0.0897 | −0.0052 | −0.0657 | −0.6545 | −0.0632 | −0.0159 | −0.0270 |
Cold season 2007-2014 | −0.1527 | −0.1611 | −0.0241 | −0.1117 | −0.7626 | −0.0965 | −0.0080 | −0.0148 |
3/17/2005-5/31/2010 | 0.0042 | −0.0025 | −0.0320 | 0.0875 | 0.2431 | 0.0461 | 0.0003 | 0.0462 |
Cold season 2005-2010 | 1.3017 | 0.1361 | 0.0749 | 0.0978 | −0.1304 | 0.0423 | 0.0228 | 0.1294 |
6/1/2010-12/31/2014 | −0.0001 | 0.0667 | 0.0225 | 0.0084 | −0.0004 | −0.0200 | −0.0079 | 0.0237 |
Cold season 2010-2014 | −0.1076 | −0.0393 | −0.0027 | −0.4760 | 0.1152 | −0.0606 | −0.0031 | −0.0500 |