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. Author manuscript; available in PMC: 2020 Feb 24.
Published in final edited form as: Environ Sci Technol Lett. 2019 Nov 11;6(12):696–701. doi: 10.1021/acs.estlett.9b00599

Figure 4. Principal Component Boxplot and Time Series by Indoor/Outdoor Environment and Wildfire Impact.

Figure 4.

(A) The probabilistic principal component 1 and 2 loadings. All but 3 loadings for component are positive indicating a positive correlation between the majority of PAHs. This allows for an easy interpretation of principal component score 1 as an aggregate measure of all PAHs. (B) Boxplot of principal component 1 score versus indoor/outdoor and by the 3 levels of wildfire smoke measured in the NOAA Hazard Mapping System (shaded colors). (C) A time series plot of principal component 1 scores by day (24 h integrated samples) and by indoor/outdoor environment. The same colors in B, showing the hazard mapping system level, are displayed as the background color.