Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents
Oxidative potential (OP) of PM2.5 is an emerging health indicator representing its ability to induce oxidative stress and cause adverse health effects. We examined pollution levels, temporal variations, and key constituents of PM2.5 OP by DTT assay in both indoor and outdoor environments in Nanjing,...
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doaj-ef1d00b4202d4206a210b0110fe48cf82021-07-19T04:09:26ZengElsevierEnvironment International0160-41202021-10-01155106684Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituentsFan Yang0Cong Liu1Hua Qian2School of Energy and Environment, Southeast University, Nanjing, China; Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing, ChinaCorresponding author at: School of Energy and Environment, Southeast University, Nanjing, China.; School of Energy and Environment, Southeast University, Nanjing, China; Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing, ChinaSchool of Energy and Environment, Southeast University, Nanjing, China; Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing, ChinaOxidative potential (OP) of PM2.5 is an emerging health indicator representing its ability to induce oxidative stress and cause adverse health effects. We examined pollution levels, temporal variations, and key constituents of PM2.5 OP by DTT assay in both indoor and outdoor environments in Nanjing, China, for over one year. Outdoor OPM (mass-normalized OP characterizes toxicity) and OPV (volume-based OP characterizes overall oxidative burden) in Nanjing were at a medium level compared to results reported for twenty-seven cities. Although PM2.5 mass concentration consistently decreased during outdoor-to-indoor transport, OPM varied by a factor of up to 2 in either direction, indicating a change of PM2.5’s ability to disrupt oxidative-reductive balance. Temporally, both outdoor and indoor OPM exhibited a significant seasonality pattern (P < 0.01) as autumn > summer > spring > winter. Outdoor and indoor daytime-nighttime OPV and OPM are fluctuating within two-fold range. In addition, the change in water-soluble Fe had the highest correlation coefficient (P < 0.05) with ΔOPM (ΔOPM = OPM, in-OPM, out) among constituents measured here. Our results suggest that development of mitigation strategies take indoor PM2.5’s OP into account, instead of outdoors only, since they differ.http://www.sciencedirect.com/science/article/pii/S0160412021003093DithiothreitolOutdoor-indoor OPPM2.5 compositionsHealth effects |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fan Yang Cong Liu Hua Qian |
spellingShingle |
Fan Yang Cong Liu Hua Qian Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents Environment International Dithiothreitol Outdoor-indoor OP PM2.5 compositions Health effects |
author_facet |
Fan Yang Cong Liu Hua Qian |
author_sort |
Fan Yang |
title |
Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents |
title_short |
Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents |
title_full |
Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents |
title_fullStr |
Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents |
title_full_unstemmed |
Comparison of indoor and outdoor oxidative potential of PM2.5: pollution levels, temporal patterns, and key constituents |
title_sort |
comparison of indoor and outdoor oxidative potential of pm2.5: pollution levels, temporal patterns, and key constituents |
publisher |
Elsevier |
series |
Environment International |
issn |
0160-4120 |
publishDate |
2021-10-01 |
description |
Oxidative potential (OP) of PM2.5 is an emerging health indicator representing its ability to induce oxidative stress and cause adverse health effects. We examined pollution levels, temporal variations, and key constituents of PM2.5 OP by DTT assay in both indoor and outdoor environments in Nanjing, China, for over one year. Outdoor OPM (mass-normalized OP characterizes toxicity) and OPV (volume-based OP characterizes overall oxidative burden) in Nanjing were at a medium level compared to results reported for twenty-seven cities. Although PM2.5 mass concentration consistently decreased during outdoor-to-indoor transport, OPM varied by a factor of up to 2 in either direction, indicating a change of PM2.5’s ability to disrupt oxidative-reductive balance. Temporally, both outdoor and indoor OPM exhibited a significant seasonality pattern (P < 0.01) as autumn > summer > spring > winter. Outdoor and indoor daytime-nighttime OPV and OPM are fluctuating within two-fold range. In addition, the change in water-soluble Fe had the highest correlation coefficient (P < 0.05) with ΔOPM (ΔOPM = OPM, in-OPM, out) among constituents measured here. Our results suggest that development of mitigation strategies take indoor PM2.5’s OP into account, instead of outdoors only, since they differ. |
topic |
Dithiothreitol Outdoor-indoor OP PM2.5 compositions Health effects |
url |
http://www.sciencedirect.com/science/article/pii/S0160412021003093 |
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