Period

Year 2013

Year 2016

Minimum

Maximum

Minimum

Maximum

Cold season

4.03 µg/l

16.24 µg/l

13.03 µg/l

17.05 µg/l

Summer season

12.10 µg/l

19.73 µg/l

13.20 µg/l

19.81 µg/l

Rainy season

7.008 µg/l

18.02 µg/l

13.05 µg/l

17.63 µg/l