United States Department of Transportation
i
Assessing the Suitability of Non-Regulatory Sensors for Particulate Matter Measurements in Transportation Applications
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2024-08-01
[PDF-4.67 MB]
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Edition:Final Report
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Abstract:In 2020, the Colorado Department of Transportation (CDOT), in collaboration with the Colorado Department of Public Health & Environment (CDPHE) Air Pollution Control Division (APCD), began monitoring along a section of Interstate (I) 270 that is slated for roadway construction. Specifically, five types of non-regulatory supplemental and informational monitoring (NSIM) sensors were installed along a 4.5-mile section of I-270. Data and experience from this study were used to assess the suitability of NSIM sensors for measuring air quality impacts before, during, and after roadway construction projects. The accuracy of the NSIM sensors for measuring particulate matter (PM) less than 2.5 micrometers in aerodynamic diameter (PM2.5) was assessed by determining overall average accuracy (linear fit of paired hourly data) and evaluating the accuracy near the 24-hour National Ambient Air Quality Standard (NAAQS) for PM2.5 (35 micrograms/meters3). This study also includes information about the operations and maintenance required for each NSIM sensor. Based on the comparisons in this study and information from previous studies, the 2B Tech AQSync and QuantAQ MODULAIR™-PM sensors were determined to be the most suitable for measuring PM during roadway construction projects. For applications requiring PM2.5 and PM10 (PM less than 10 micrometers in aerodynamic diameter) monitoring, as well as an NSIM sensor that can be quickly set up and moved, the QuantAQ MODULAIR™-PM was found to be most suitable. For applications requiring the monitoring of a broader set of pollutants, the 2B Tech AQSync was found to be most suitable.
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