Month

Feiwu Cave NAI Concentration

Shoushan Lake NAI Concentration

Level

Air Freshness

JAN

10,087/cm³

19780/cm³

7

Extremely Pure and Fresh

FEB

8870/cm³

17075/cm³

7

Extremely Pure and Fresh

MAR

8585/cm³

15789/cm³

7

Extremely Pure and Fresh

APR

10,348/cm³

13877/cm³

7

Extremely Pure and Fresh

MAY

8748/cm³

14550/cm³

7

Extremely Pure and Fresh

JUN

8580/cm³

13516/cm³

7

Extremely Pure and Fresh

JUL

9509/cm³

12494/cm³

7

Extremely Pure and Fresh

AUG

9192/cm³

12425/cm³

7

Extremely Pure and Fresh

SEP

5590/cm³

15055/cm³

7

Extremely Pure and Fresh

OCT

9711/cm³

10750/cm³

7

Extremely Pure and Fresh

NOV

4294/cm³

15674/cm³

7

Extremely Pure and Fresh

DEC

6302/cm³

13164/cm³

7

Extremely Pure and Fresh