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Particulate reactive oxygen species on total suspended particles – measurements in residences in Austin, Texas
Author(s) -
Khurshid S. S.,
Siegel J. A.,
Kinney K. A.
Publication year - 2016
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/ina.12269
Subject(s) - particulates , environmental science , environmental chemistry , environmental engineering , chemistry , organic chemistry
The biologically relevant characteristics of particulate matter ( PM ) in homes are important to assessing human health. The concentration of particulate reactive oxygen species ( ROS ) was assessed in eight homes and was found to be lower inside (mean ± s.e. = 1.59 ± 0.33 nmol/m 3 ) than outside (2.35 ± 0.57 nmol/m 3 ). Indoor particulate ROS concentrations were substantial and a major fraction of indoor particulate ROS existed on PM 2.5 (58 ± 10%), which is important from a health perspective as PM 2.5 can carry ROS deep into the lungs. No obvious relationships were evident between selected building characteristics and indoor particulate ROS concentrations, but this observation would need to be verified by larger, controlled studies. Controlled experiments conducted at a test house suggest that indoor ozone and terpene concentrations substantially influence indoor particulate ROS concentrations when outdoor ozone concentrations are low, but have a weaker influence on indoor particulate ROS concentrations when outdoor ozone concentrations are high. The combination of substantial indoor concentrations and the time spent indoors suggest that further work is warranted to assess the key parameters that drive indoor particulate ROS concentrations.