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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Indoor Air. 2017 Apr 10;27(5):1022–1029. doi: 10.1111/ina.12377

FIGURE 2. Fine particulate matter levels by location.

FIGURE 2

Boxplots of integrated 24-hour PM2.5 levels by sampling location. Horizontal red line is at PM2.5 concentration of 25 micrograms/m3, the World Health Organization (WHO) guideline level for acceptable indoor 24-hour PM2.5 concentrations.