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Health effects of concurrent ambient and tobacco smoke-derived particle exposures at low concentrations in children with asthma

Abstract

Exposure to particulate matter less than 2.5 microns from either ambient pollution (AMB-PM2.5) or secondhand smoke (SHS-PM2.5) have been associated with asthma worsening, but there is little information on effects and relative potency with concurrent exposures. We studied health effects of concurrent exposures to AMB-PM2.5 and SHS-PM2.5 over a 6-year period in schoolchildren with asthma. Regression calibration with instrumental variables (RCIV) was utilized to estimate effects of personal exposure to low-level SHS and AMB-PM2.5 on daily albuterol usage and urinary leukotriene E4 (uLTE4; a biomarker of asthma-related inflammation) using urine cotinine and concentrations from fixed and personal pollution monitors. Each IQR increase in SHS-PM2.5 exposure was associated with a 6.7% increase (95% CI: 1.0–12.8%) in uLTE4 on the same day and 9.4% increase (95% CI: −2.6 to 22.7%) in albuterol use the next day, when children were co-exposed to mean levels of AMB-PM2.5. The dose-response relationship between health outcomes and one pollutant was higher at lower levels of the other pollutant. For example, at lower levels of predicted SHS-PM2.5 exposure, increases in health outcomes per IQR increase in AMB-PM2.5 ranged between 2 and 5%, but were negligible at higher SHS-PM2.5 levels. Comparing at equivalent co-exposure levels, SHS-PM2.5 was 1.6 times more potent than AMB-PM2.5 for uLTE4 (95% CI: 1.1–2.3); estimates for albuterol usage were similar but less significant. Effects at mean co-exposure levels were closer [SHS to AMB-PM2.5 potency ratio = 1.2 (95% CI: 0.9–1.5) for uLTE4 and 1.2 (95% CI: 0.7–1.9) for albuterol usage]. In summary, concurrent exposure to relatively low levels of SHS and AMB-PM2.5 were associated with health outcomes in asthmatic schoolchildren. Dose responses varied with changes in the relative amounts of each pollutant; SHS-PM2.5 was observed to be more potent than AMB-PM2.5 when co-exposure levels were equivalent.

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Fig. 1: Relative potency of pollutants.

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Acknowledgements

We would like to thank Arden Pope for his review and helpful comments on this paper.

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Correspondence to Matthew Strand.

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Strand, M., Rabinovitch, N. Health effects of concurrent ambient and tobacco smoke-derived particle exposures at low concentrations in children with asthma. J Expo Sci Environ Epidemiol 30, 785–794 (2020). https://doi.org/10.1038/s41370-020-0201-y

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