Assessing the accuracy of commercially available gas sensors for the measurement of ambient ozone and nitrogen dioxide

Details

• Alternative Title:
  J Occup Environ Hyg
• Personal Author:
  Isiugo, Kelechi ; Newman, Nicholas ; Jandarov, Roman ; Grinshpun, Sergey A. ; Reponen, Tiina
• Description:
  The objective of the National Institute for Occupational Safety and Health (NIOSH) accuracy criterion is to ensure that measurements from monitoring devices are within ±25% of the true concentration of the analyte with 95% certainty. To determine whether NO| and O| sensors meet this criterion, three commercially available units (Cairclip O|/NO|, Aeroqual NO|, and Aeroqual O| sensors) were co-located three times with validated instruments (NO| chemiluminescence [NO|] and photometric O| analyzers [O|]) at an outdoor monitoring station. As cofactors of sensor performance such as temperature (T) and relative humidity (RH) potentially influence the response of NO| and O| sensors, corrections for cofactors were made by using T, RH, and the sensor measurements to predict measurements made by NO| and O| during the first co-location period (training dataset). The developed models were tested in the merged data obtained from the second and third co-location periods (testing dataset). In the training and testing datasets, the mean NO| as measured by NO| was 4.6 ppb (range = 0.4-35 ppb) and 9.4 ppb (range = 1-37 ppb), respectively. The mean O| in the training and testing datasets as measured by O| was 38.8 ppb (range = 1-65 ppb) and 35.7 ppb (range = 1-61 ppb), respectively. None of the sensor measurements in the training dataset were within the NIOSH accuracy criterion (mean error ≥25%). After correcting for cofactors of sensor performance, the accuracy of the Cairclip O|/NO| and the Aeroqual O| sensors considerably improved when tested with the testing dataset (mean error = -1% and 14%, respectively). However, the Aeroqual NO| sensor had an error that was not within ±25%. Raw measurements from the tested sensors may be unsuitable for assessing workers' exposure to NO| and O|. Corrections for cofactors of Cairclip O|/NO| and Aeroqual O| sensor performance are required for more accurate occupational exposure assessment.
• Keywords:
  Aeroqual Air Pollutants Cairclip Direct-reading Instruments Environmental Monitoring Humidity Low-cost Sensors Nitrogen Dioxide Occupational Exposure Ozone Temperature

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• Source:
  J Occup Environ Hyg. 15(11):782-791
• Pubmed ID:
  30156975
• Pubmed Central ID:
  PMC6324576
• Document Type:
  Journal Article
• Funding:
  P30 ES006096/ES/NIEHS NIH HHSUnited States/ ; T42 OH008432/OH/NIOSH CDC HHSUnited States/ ; T42OH008432/ACL/ACL HHSUnited States/
• Volume:
  15
• Issue:
  11
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:46fe447daf34f11022554f97ca710acea2914f43a06ba0634a5dd8dc8a820b34
• Download URL:
  https://stacks.cdc.gov/view/cdc/61830/cdc_61830_DS1.pdf
• File Type:
  [PDF - 369.12 KB ]