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. Author manuscript; available in PMC: 2019 Jun 10.

Published in final edited form as: J Expo Sci Environ Epidemiol. 2017 Dec 29;28(4):319–327. doi: 10.1038/s41370-017-0013-x

Figure 2. — Frequency of days with HMS smoke plumes visible above O₃ monitoring sites (panel a) and above PM_2.5^FRM monitoring sites (panel b). Monitoring sites are colored by the quartiles of the frequency distribution with red denoting locations that experienced a frequency of smoke plume days in the top quartile.

Figure 2. — Frequency of days with HMS smoke plumes visible above O₃ monitoring sites (panel a) and above PM_2.5^FRM monitoring sites (panel b). Monitoring sites are colored by the quartiles of the frequency distribution with red denoting locations that experienced a frequency of smoke plume days in the top quartile.