Year

Term

Pollutant concentration (mg/m³)

Quality level

Primary pollutant

Ⅰ level

Ⅱ level

Ⅲ level

2011

Heating period

0.373

0.515

0.584

III level

SO₂

2012

Non-heating period

0.642

0.801

0.701

II level

PM₁₀

Heating period

0.519

0.610

0.675

III level

SO₂

2013

Non-heating period

0.607

0.776

0.416

II level

PM₁₀

Heating period

0.466

0.557

0.766

II level

SO₂

2014

Non-heating period

0.679

0.645

0.392

I level

PM₁₀

Heating period

0.552

0.775

0.834

III level

SO₂

2015

Non-heating period

0.483

0.801

0.416

II level

PM₁₀

Heating period

0.452

0.543

0.792

III level

SO₂

2016

Non-heating period

0.694

0.820

0.453

II level

PM₁₀