Investigating Travel Behavior and Air Quality in Northern Utah

Singleton, Patrick A.; Humagain, Prasanna; Mandolakani, Fariba Soltani; Saheli, Mahyar Vahedi · 2024 · ROSA P / North Dakota State University

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Summary

This study investigates how episodic poor air quality influences individual travel behaviors in Cache County, Utah, addressing a gap in person-level longitudinal data regarding travel demand management strategies. Motivated by the public health risks of winter temperature inversions and the limited evidence on the effectiveness of voluntary "soft" policies like the TravelWise program, the research aims to understand how measured or perceived air pollution affects daily travel amounts, perceptions, and the attribution of responsibility for pollution. The researchers conducted a multi-phase longitudinal survey during winter 2019, recruiting adults from sampled U.S. Census block groups. The data collection involved an initial survey on personal and household characteristics, followed by three two-day travel diary surveys designed to capture varying air pollution levels, and concluded with a final survey on perceptions. This approach yielded panel data for approximately 350 adults across roughly 200 households. The analysis utilized panel data regression to assess changes in trip frequency and travel time, latent class analysis to segment respondents by their attribution of responsibility for air pollution, and detailed modeling of 20 activity and travel outcomes controlled for neighborhood type (urban vs. suburban/rural). The findings reveal that while respondents were generally aware of elevated pollution levels, there was little change in overall trip frequencies or total travel times in response to poor air quality. However, segmentation analysis identified three distinct groups based on how individuals attributed responsibility for pollution: high internal–high external attributors, moderate attributors, and low attributors. Those who assumed greater personal and external responsibility reported more travel behavior changes. Furthermore, neighborhood-specific analyses showed divergent responses: urban residents increased mandatory activities and total travel time, driven by higher usage of both public transit and private vehicles. In contrast, suburban and rural residents traveled shorter distances and showed a notable increase in active mode usage, such as walking and biking. These patterns suggest "altruistic" behavioral responses rather than purely risk-averse ones. The study concludes that voluntary awareness campaigns have small but beneficial effects on travel behavior, particularly among those who feel responsible for air quality. However, the modest impact suggests that "soft" policies alone are insufficient for substantial emission reductions. The authors recommend more rigorous, semi-mandatory strategies and infrastructure improvements that reduce automobile dependence, such as enhanced public transit and active transportation options, to effectively mitigate air pollution during inversion events.

Key finding

While overall trip frequencies and travel times remained stable during poor air quality episodes, urban residents increased mandatory activities and travel time while suburban and rural residents reduced vehicle miles traveled and increased active transportation, with behavioral changes strongly linked to individual attribution of responsibility for pollution.

Methodology

survey

Sample size: 350

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• urban rural setting