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<p>Concentrations of particles less than 2.5 microns in diameter (PM<sub>2.5</sub>) measured at a monitoring station in Dallas, Texas from 2015 to 2024 were evaluated over daily and hourly time intervals. Daily averages showed a seasonal pattern, with typically higher concentrations in summer months, and trended slightly upward over 10&#xa0;years. Dust from the Sahara or Great Plains affected all but one episode of high PM<sub>2.5</sub> over one or more consecutive day(s). Hourly data, compiled for days with average concentrations above 30&#xa0;µg/m<sup>3</sup>, showed fluctuations rather than continual changes in PM<sub>2.5</sub> concentration before and after peak hourly concentration. Large clouds of particulate comprising smaller coalescing plumes caused fluctuations rather than continual changes in concentration. On most days, hourly PM<sub>2.5</sub> concentrations varied widely around the average concentration. Results of this study highlight the importance of external sources, including complex dust plumes, and hourly time intervals for assessing exposure to PM<sub>2.5</sub>.</p>

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Hourly trends of fine particulate matter on days with high concentrations at an air monitoring site in Dallas, Texas

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Paul F. Hudak

摘要

Concentrations of particles less than 2.5 microns in diameter (PM2.5) measured at a monitoring station in Dallas, Texas from 2015 to 2024 were evaluated over daily and hourly time intervals. Daily averages showed a seasonal pattern, with typically higher concentrations in summer months, and trended slightly upward over 10 years. Dust from the Sahara or Great Plains affected all but one episode of high PM2.5 over one or more consecutive day(s). Hourly data, compiled for days with average concentrations above 30 µg/m3, showed fluctuations rather than continual changes in PM2.5 concentration before and after peak hourly concentration. Large clouds of particulate comprising smaller coalescing plumes caused fluctuations rather than continual changes in concentration. On most days, hourly PM2.5 concentrations varied widely around the average concentration. Results of this study highlight the importance of external sources, including complex dust plumes, and hourly time intervals for assessing exposure to PM2.5.