Comparison of the rate of healthcare encounters for influenza from source-specific PM before and after tier 3 vehicle standards in New York state.

Background: Influenza healthcare encounters in adults associated with specific sources of PM is an area of active research.

Objective: Following 2017 legislation requiring reductions in emissions from light-duty vehicles, we hypothesized a reduced rate of influenza healthcare encounters would be associated with concentrations of PM from traffic sources in the early implementation period of this regulation (2017-2019).

Methods: We used the Statewide Planning and Research Cooperative System (SPARCS) to study adult patients hospitalized (N = 5328) or treated in the emergency department (N = 18,247) for influenza in New York State.

PM and its components and respiratory disease healthcare encounters - Unanticipated increased exposure-response relationships in recent years after environmental policies.

Prior studies reported excess rates (ERs) of cardiorespiratory events associated with short-term increases in PM concentrations, despite implementation of pollution-control policies. In 2017, Federal Tier 3 light-duty vehicle regulations began, and to-date there have been no assessments of population health effects of the policy. Using the NYS Statewide Planning and Research Cooperative System (SPARCS) database, we obtained hospitalizations and ED visits with a principal diagnosis of asthma or chronic obstructive pulmonary disease (COPD) for residents living within 15 miles of six urban PM monitoring sites in NYS (2014-2019).