Tunnel CO and NOx Monitoring with GasTiger 2000

Hello. This project used a portable GasTiger 2000 to monitor carbon monoxide (CO) and nitrogen oxides (NOx) inside a road tunnel.

Tunnel air-quality reference limits: carbon monoxide (CO) below about 70 ppm and nitrogen oxides (NOx) below about 20 ppm.

Measured results (Seoul road tunnel): CO 4.7–7.6 ppm and NOx 0.4–2.4 ppm — both within the reference limits.

Tunnel air-quality management matters: colorless, odorless toxic gases can affect drivers without warning, especially in long tunnels or after an incident — this should never be taken lightly.

The supplied unit was a GasTiger 2000 with a 0–100 ppm CO channel, paired with a condensation trap to limit the effect of moisture inside the tunnel. The measurement range was selected to align with the Korea Expressway Corporation Road Traffic Research Institute's tunnel air-quality reference of 0–70 ppm.

We hope this trial supports a permanently installed FIX800 unit along the tunnel roadside in the future.

Please feel free to contact us with any questions about tunnel gas detection.

Thank you.

Frequently Asked Questions (FAQ)

Q1. What equipment was used in this project?

A portable GasTiger 2000 was used to monitor carbon monoxide (CO) and nitrogen oxides (NOx) inside a road tunnel.

Q2. What are the tunnel air-quality reference limits?

Carbon monoxide below about 70 ppm and nitrogen oxides below about 20 ppm, based on tunnel air-quality guidance.

Q3. What were the actual measured results?

Monitoring in a Seoul road tunnel recorded CO at 4.7–7.6 ppm and NOx at 0.4–2.4 ppm, both within the reference limits.

Q4. What was the specification of the supplied unit?

A GasTiger 2000 with a 0–100 ppm CO channel, supplied together with a condensation trap to minimize the effect of moisture inside the tunnel.

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