10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Daytime and Nighttime Particulate Matter Toxicity in an Urban City
TING ZHANG, Maosheng Yao, Peking University
Abstract Number: 665 Working Group: Health Related Aerosols
Abstract Human exposure to particulate matters, especially ultrafine particles, can cause a wide range of diseases. However, toxicity of particles during the day and night can be quite distinct from each other since there might be some very different chemical reactions occurring. Size-fractionated (from 0.01μm to 18μm, in 13 size ranges) particulate matter samples were collected using NanoMoudi in daytime and nighttime in Beijing from September 11th to 14th, 2017. Dithiothreitol (DTT) assay was used to evaluate the oxidative potential of ambient particles. The result showed that the PM toxicity in nighttime particles was significantly higher than that in daytime for certain size ranges. Basically, both for the daytime and nighttime, oxidative potential was found to have increased with decreasing size. These results indicated that PM related health effects could be different between daytime and nighttime, and suggest a need to especially protect people from PM exposure during the night.