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. 2021 Oct 30;806:151349. doi: 10.1016/j.scitotenv.2021.151349

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Fig. 3 — Staff-reported barriers towards increasing ventilation using CO₂ monitors. A. Any implementation barriers identified by staff (N = 32) responding to post-study survey. B. The most important barrier indicated by each of the respondents. HVAC = heating, ventilation and air conditioning.