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. 2020 Apr 2;128(4):047002. doi: 10.1289/EHP5732

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Figure 2 displays the UFP exposure quartiles from the AERMOD results up to 20 km from the LAX airfield. The inset is the key for quartiles of UFP exposure, which are as follows: first, second, third, and fourth quartiles. — Estimated UFP exposure quartiles from AERMOD results. Base layers obtained from USGS.gov (USGS 2019).