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