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The baseline zero and response values for CH4 and CO2 are checked every six months and changes are incorporated into the data. All reports of errors by the LGR result in flagged data. CO2 values are flagged as anomolous if they fall below 350 ppm, significantly below the background CO2 level, or above 1000 ppm, very high for an urban setting in most contexts. H2O data is outside the boundaries of 20 ppm to 70,000 ppm as outside these boundaries the accuracy of the instrument, according to Los Gatos Research, becomes suspect. CH4 levels are flagged if they are below 1.5 ppm, to account for the background level of methane already in the atmosphere, or above 30 ppm, a level rarely reached in an urban environment. CO levels are flagged if they are below 50 ppb, to account for the background level of CO already in the atmosphere, or above 1400 ppb, a level rarely reached in an urban environment.

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