Fig. 3: Monthly baseline drift of each sensor type. | npj Climate and Atmospheric Science

Fig. 3: Monthly baseline drift of each sensor type.

From: In-situ baseline calibration approach for enhanced data quality of large-scale air sensor monitoring networks

Fig. 3

a–d show baseline variation for NO2, NO, CO, and O3 sensors during the long-term co-location test. The monthly baseline values for each sensor were mathematically centralized by subtracting the mean baseline value from each individual monthly reading. Solid lines depict trendlines for individual sensors, with their slopes (in ppb/month) calculated and annotated in matching colors on the graph. Gray dashed lines indicate the boundary limits of y = ±5 ppb for NO2, NO, and O3, and y = ±100 ppb for CO, serving as reference lines to assess the magnitude of baseline variation.

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