Addition/Correction Cite This: Environ. Sci. Technol. 2018, 52, 14568−14569
pubs.acs.org/est
Corrections to “Ambient Nonmethane Hydrocarbon Levels Along Colorado’s Northern Front Range: Acute and Chronic Health Risks” Lisa M. McKenzie,* Benjamin Blair, John Hughes, William B. Allshouse, Nicola J. Blake, Detlev Helmig, Pam Milmoe, Hannah Halliday, Donald R. Blake, and John L. Adgate Environ. Sci. Technol. 2018, 52 (8), 4514−4525. DOI: 10.1021/acs.est.7b05983
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S Supporting Information *
the mean concentrations in Boulder and Eastern Boulder County (p < 0.0001) (Figure 3b, Table S6b). Page 4519. The second paragraph under the Noncancer Hazards header should read as follows: Figure 4b presents chronic HQ and HI estimates based on TWA mean 3 h (Platteville) and mean 72−96 h (Boulder and Erie) sample results (Supporting Information Table S8). Total chronic HIs were highest in Platteville, where the total HI was 0.60, followed by Eastern Boulder County, and then Boulder. Nervous system, respiratory system, blood system, and developmental HIs were 1600 m from nearest O&G facility) and Eastern Boulder County (448−625 m from nearest O&G facility). Mean ambient benzene and ethylbenzene concentrations did not vary significantly between locations, although the lowest mean concentrations occurred in samples collected in Boulder. Mean ambient toluene, ethylbenzene, and total xylene concentrations in Platteville were 1.6−2.6 times higher than
Figure 3. (B) Distributions and means of selected hydrocarbon concentrations from 3 to 96 h samples by distance from the nearest oil and gas facility. μg/m3 = micrograms per cubic meter, m = meters, white dots are median values, red dots are mean values, black bars are the 25−75 percentile range, text labels are transformed mean values. Published: December 5, 2018 © 2018 American Chemical Society
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DOI: 10.1021/acs.est.8b06179 Environ. Sci. Technol. 2018, 52, 14568−14569
Environmental Science & Technology
Addition/Correction
Figure 4. (B) Chronic hazard quotients and hazard indices for residents living in Boulder, Eastern Boulder County, and Platteville based on 3, 72, and 96 h sample results.
Figure 5. Lifetime excess cancer risks (30 year exposure duration) for residents >1600, 610−1600, 152−610, and within 152 m from an oil and gas facility based on 1 min sample results. 1Based on time weighted average concentration (TWA) from 1 min and 1 h samples collected during DISCOVER AQ Summer 2014 Field Campaign (as cited in reference 37 in the original article). 2Based on mean concentrations from 12 72−96 h samples collected in Boulder CO (as cited in reference 38 in the original article), 47 72−96 h samples collected at 4 sites in Erie CO (as cited in reference 38 in the original article), and time weighted average concentration (TWA) from 41 3 h samples from the Colorado Department of Public Health and Environment Platteville monitoring site (as cited in reference 39 in the original article).
3, 72, and 96 h sample results (Supporting Information Table S10). For similar scenarios, the cumulative lifetime excess cancer risks based on mean 72−96 h sample results are greater than risks based on TWA mean 1 min and 3 h sample results.
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ASSOCIATED CONTENT
S Supporting Information *
The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b06179. Corrected Tables S4, S6b, S8, and S10 (PDF)
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DOI: 10.1021/acs.est.8b06179 Environ. Sci. Technol. 2018, 52, 14568−14569
