Figure 5
The graph is titled “PPM Level-School 2 over D”. The horizontal axis shows dates ranging from 10.10.2022 to 12.01.2022. The vertical axis is labeled “P P M (parts per million)” and ranges from 0 to 1,500 in increments of 500 units. A single continuous line represents the P P M levels across the displayed period. The baseline values mostly remain between approximately 520 and 650 parts per million. Repeated sharp spikes rise above the baseline at frequent intervals, reaching peak values between approximately 800 and 1,300 parts per million. In the early part of the timeline, multiple clusters of spikes occur, with several peaks approaching or exceeding 1,000 parts per million. In the middle portion, the values gradually decline toward around 550 parts per million, followed by another series of spikes that rise to approximately 900 to 1,100 parts per million. Toward the later part of the period, several prominent peaks reach close to 1,300 parts per million, after which the values again drop back to near baseline levels around 600 parts per million. The overall pattern shows recurring cycles of rapid increases followed by slower declines throughout the entire time range. Note: All numerical values are approximated.Measured CO2 levels (ppm) from Datalogger in School 2, zone D