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How long does a Nighthawk carbon monoxide detector last? 

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The results of this work may be applicable to further development of carbon monoxide sensors for fire detection at its earlier stages.
A field measurement program showed that reduced mixing volumes due to nocturnal radiation inversions were probably responsible for this build up of carbon monoxide despite night-time reductions in the principal carbon monoxide source, vehicular traffic.
The results are consistent with the growing body of evidence that carbon monoxide has a general rate-decreasing effect but no specific effect on measures of temporal discrimination.
These tests have shown the reliability of the receiver system, which allows us in the future to use designed radiometer for continuous monitoring of carbon monoxide.
It is shown that the carbon monoxide desportion spectrum can be used in the detection of a carbon coverage much below the detectability level of AES.
The authors conclude that fixed outdoor CO monitors are not, in general, providing useful estimates of carbon monoxide exposures of urban residents.

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