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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Environ Int. 2019 Feb 1;125:97–106. doi: 10.1016/j.envint.2018.12.025

Fig. 1.

Fig. 1.

Average NOx (ppb) for southern California Children's Health Study (CHS) residential locations, 1992–2012. Average NOx using stage 3 of the Li et al. (2017) model which uses the averaged stage 2 NOx estimates and constrained optimization to re-predict exposure based on physical constraints meant to mimic known or observed real-life behavior of NOx. Average NOx for each unique CHS location displayed using quantiles (6).