Aspect

CO

PM2.5

NO

NO₂

SO₂

O₃

Before PH

1

1

1

1

1

1

On PH

0.88

0.96

0.89

0.86

0.97

0.96

After PH

0.97

0.93

0.95

0.96

0.91

0.89

% reduction

12

4

11

14

3

4