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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: Atmos Environ (1994). 2017 Sep 4;169:113–127. doi: 10.1016/j.atmosenv.2017.09.003

Figure 2.

Figure 2

Boxplots of PNC by (a) month, (b) time of day, and (c) wind direction measured at central sites (black), homes (blue), and with a mobile laboratory (red) in Boston. Mobile monitoring occurred between 05:00 and 21:00.