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>>NO2

When nitrogen is transformed into ammonia through the decomposition of bacteria in the water and oxygenized, it will become NO2.  Consequently, it usually exists in heavy polluted water.  Owing to the fact that it is an unstable substance, NO2 usually consumes an abundance of oxygen in the water, causing the death of fish resulting from suffocation.

NO2 Testing Result at Plum Tree Creek

Observation Point

1

2

3

4

5

6

7

8

9

10

11

12

13

Low Flow

0.005

0.005

0.2

0.2

0.1

0.01

0.02

0.02

0.5

1

0.5

1

0.5

High Flow

0.005

0.005

0.1

0.2

0.1

0.01

0.01

0.01

0.5

1

1

1

0.5

NO2 Statistical Chart of Plum Tree Creek

Analysis:

Origin-pollution free

Headstream-mild pollution

Midstream-mild polluted

Downstream-serious polluted

There was not much difference between high and low flow.

In the midstream, the quality of the water is better than the downstream because the river in this part flows through more undeveloped forests where there is less contamination.  What’s more, with the function of rivers’ natural filtering system, the water in the midstream tends to be cleaner. 
Prepare and learn about the equipment
Good water quality in origin
Fine water quality in midstream
Serious polluted in downstream
It’s not difficult to do he water testing.