Age-Specific Associations of Ozone and PM 2.5 with Respiratory Emergency Department Visits in the US.

RATIONALE: While associations between air pollution and respiratory morbidity for adults 65 and older are well-documented in the United States, the evidence for people under 65 is less extensive. To address this gap, the Centers for Disease Control and Prevention's National Environmental Public Health Tracking Program collected respiratory emergency department (ED) data from 17 states.

OBJECTIVES: Estimate age-specific acute effects of ozone and fine particulate matter (PM2.5) on respiratory ED visits.

METHODS: We conducted time-series analyses in 894 counties by linking daily respiratory ED visits with estimated ozone and PM2.5 concentrations during the week before the date of the visit. Overall effect estimates were obtained using a Bayesian hierarchical model to combine county estimates for each pollutant by age group (children 0-18, adults 19-64, adults ≥65, and all ages) and by outcome group (acute respiratory infection, asthma, chronic obstructive pulmonary disease, pneumonia, and all respiratory ED visits).

MEASUREMENTS AND MAIN RESULTS: Rate ratios (95% credible interval) per 10 µg/m3 increase in PM2.5 and all respiratory ED visits were 1.024 (1.018, 1.029) among children, 1.008 (1.004, 1.012) among adults <65, and 1.002 (0.996, 1.007) among adults 65 and older. Per 20 ppb increase in ozone, rate ratios were 1.017 (1.011, 1.023) among children, 1.051 (1.046, 1.056) among adults <65, and 1.033 (1.026, 1.040) among adults 65 and older. Associations varied in magnitude by age group for each outcome group.

CONCLUSIONS: These results address a gap in the evidence used to ensure adequate public health protection under national air pollution policies.