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Exposures to particulate matter at middle school in Xi'an: A study on health risks and effective inflammatory responses

Exposures to particulate matter at middle school in Xi'an: A...

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第十三届全国气溶胶会议

作者： Hongmei XU Benjamin GUINOT Junji CAO Department of Environmental Science and Engineering Xi’an Jiaotong University Key Lab of Aerosol Chemistry&Physics Institute of Earth EnvironmentCAS Laboratoire d'Aérologie Universitéde ToulouseCNRSUPS

Air pollutant measurement and respiratory inflammatory tests were conducted at a junior secondary school in Xi’an, Northwestern *** substances including particulate matters(PM), black carbon(bc), and particle-bounded polycyclic aromatic hydrocarbons(pahs) were quantified both indoors and outdoors of the *** characterization with organic tracers and particle sizedistribution demonstrated that the school’s air was mostly polluted by combustion emissions from the surrounding *** evaluation of health assessment related to air quality was conducted by two methods, including potential risk estimation of air pollutants and direct respiratory inflammatory *** incremental lifetime cancer risks(ILCRs) associated with pahs were estimated, and were 1.62×10 and 2.34×10 respectively, for indoor and outdoor fine *** the values exceeded the threshold value of 1×10, demonstrating that the carcinogenic pahs are a health threat to the *** inflammatory responses of 50 students who studied in the sample classroom were examined with a fractional exhaled nitric oxide(Fe NO) test, with the aid of health *** average Fe NO concentration was 17.4±8.5 ppb, which was slightly lower than the recommended level of 20 ppb established by the American Thoracic Society(ATS) for ***, a wide distribution and 6% of the values were >35 ppb, suggesting that the potentials was still high for eosinophilic inflammation and responsiveness to corticosteroids.A preliminary interpretation of the relationship between air toxins and respiratory inflammatory response demonstrated the high exposure cancer risks and inflammatory responses of the students to PMs in the city.

关键词： PM bc and pahs Cancer risks FeNO Health assessment

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