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Chicago transit authority train noise exposure.

Linh T Phan1, Rachael M Jones1

  • 1a Division of Environmental and Occupational Health Sciences , School of Public Health, University of Illinois at Chicago , Chicago , Illinois.

Journal of Occupational and Environmental Hygiene
|March 10, 2017
PubMed
Summary
This summary is machine-generated.

Chicago Transit Authority (CTA) train noise levels were measured, with the Blue Line showing the highest average decibel levels. Tunnels significantly increased noise, indicating a need for noise management strategies.

Keywords:
Chicago Transit Authoritynoisepublic transportationtrains

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Area of Science:

  • Environmental Health
  • Transportation Noise
  • Acoustics

Background:

  • Occupational and environmental noise exposure is a public health concern.
  • Urban transit systems generate significant noise, potentially impacting passenger and operator health.
  • Previous studies have not comprehensively assessed noise levels across all Chicago Transit Authority (CTA) lines.

Purpose of the Study:

  • To quantify and characterize noise exposure for riders on Chicago Transit Authority (CTA) trains.
  • To identify specific train lines and segments with the highest noise levels.
  • To assess potential risks associated with noise exposure and inform noise management strategies.

Main Methods:

  • Noise levels were measured twice on each segment of 7 of the 8 CTA train lines.
  • 48 time-series measurements were collected across various track types (tunnel, elevated, ground level).
  • Data analysis focused on average and maximum noise levels (dBA) and comparisons between lines and track segments.

Main Results:

  • The Blue Line exhibited the highest average noise levels (76.9 dBA).
  • The maximum noise level recorded was 88.9 dBA, occurring in a tunnel segment.
  • Noise levels were significantly higher in tunnels compared to elevated or ground-level tracks.

Conclusions:

  • While 8-hour noise doses for riders are unlikely to exceed occupational limits, intermittent high noise levels (exceeding 85 dBA) can cause discomfort.
  • Train operators may face higher noise exposure than riders due to cab design.
  • Noise management interventions, particularly in tunnel segments, are recommended for CTA trains.