The difference between the measurements during open window ventilation periods varied and is also illustrated by the CIMS-to-LP/LIF measurement ratios in Figure 6 , indicating that spatial variation of HONO within the house may be significant when the windows are open.
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Comparison of Simultaneous Measurements of Indoor Nitrous Acid: Implications for the Spatial Distribution of Indoor HONO Emissions.
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The sentences
The slope of the correlation suggests that on average the CIMS measurements were greater than LP/LIF measurements and may be indicative of a small spatial gradient between the two instruments that may or may not be significant but is consistent with the location of the CIMS instrument closer to the strong emission sources in the kitchen.