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Fig. 1 | Environmental Health

Fig. 1

From: Air toxics and early childhood acute lymphocytic leukemia in Texas, a population based case control study

Fig. 1

1,3-Butadiene Ambient Air Levels in Texas by NATA year. Exposure groups: Low (0-24th percentile); Medium (25-49th percentile); Medium-High (50–74th percentile); High (75–100th percentile) based on distribution among controls. Boundary lines for census tracts were removed for the Medium, Medium-High, and High groups and graduated color used instead to improve readability of maps and spatial distribution of exposure quartiles

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Environmental Health

ISSN: 1476-069X