Volatile organic compound conversion by ozone, hydroxyl radicals, and nitrate radicals in residential indoor air: magnitudes and impacts of oxidant sources

Details

• Personal Author:
  Waring MS ; Wells JR
• Description:
  Indoor chemistry may be initiated by reactions of ozone (O3), the hydroxyl radical (OH), or the nitrate radical (NO3) with volatile organic compounds (VOC). The principal indoor source of O3 is air exchange, while OH and NO3 formation are considered as primarily from O3 reactions with alkenes and nitrogen dioxide (NO2), respectively. Herein, we used time-averaged models for residences to predict O3, OH, and NO3 concentrations and their impacts on conversion of typical residential VOC profiles, within a Monte Carlo framework that varied inputs probabilistically. We accounted for established oxidant sources, as well as explored the importance of two newly realized indoor sources: (i) the photolysis of nitrous acid (HONO) indoors to generate OH and (ii) the reaction of stabilized Criegee intermediates (SCI) with NO2 to generate NO3. We found total VOC conversion to be dominated by reactions both with O3, which almost solely reacted with D-limonene, and also with OH, which reacted with D-limonene, other terpenes, alcohols, aldehydes, and aromatics. VOC oxidation rates increased with air exchange, outdoor O3, NO2 and D-limonene sources, and indoor photolysis rates; and they decreased with O3 deposition and nitric oxide (NO) sources. Photolysis was a strong OH formation mechanism for high NO, NO2, and HONO settings, but SCI/NO2 reactions weakly generated NO3 except for only a few cases. [Description provided by NIOSH]
• Subjects:
  Air Pollution, Indoor Chemistry Environmental Health Occupational Health Safety
• Keywords:
  Author Keywords: Indoor Chemistry Chemical-composition Chemical-properties Indoor-air-pollution Indoor-environmental-quality Models Monte Carlo Modeling Organic-compounds Photolysis Terpene-compounds Terpenes VOC Oxidation Volatiles

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• ISSN:
  1352-2310
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  382-391
• Volume:
  106
• NIOSHTIC Number:
  nn:20044756
• Citation:
  Atmos Environ 2015 Apr; 106:382-391
• Contact Point Address:
  Michael S. Waring, Drexel University, Department of Civil, Architectural and Environmental Engineering, 3141 Chestnut St., Philadelphia, PA 19104
• Email:
  msw59@drexel.edu
• CAS Registry Number:
  Nitrogen dioxide (CAS RN 10102-44-0) ; Nitrous oxide (CAS RN 10024-97-2)
• Federal Fiscal Year:
  2015
• NORA Priority Area:
  Healthcare and Social Assistance ; Services
• Peer Reviewed:
  True
• Source Full Name:
  Atmospheric Environment
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eefb44d28b6528a888f724bb2f9694ddc5a69f07d2bd023c44bdf7a5014e29cbfc8dfaf0895483e736f1de7cef572897d35fc825233eee9499406ebb87957751
• Download URL:
  https://stacks.cdc.gov/view/cdc/200391/cdc_200391_DS1.pdf
• File Type:
  [PDF - 1.48 MB ]