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fengyudong

金虫 (小有名气)

应助: 0 (幼儿园)
金币: 1128.3
散金: 378
帖子: 228
在线: 90.9小时
虫号: 3132834
注册: 2014-04-13
性别: GG
专业: 环境污染化学

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Previous studies have associated ambient
particulate chemical constituents with adverse cardiopulmonary
health effects. However, specific pollution sources behind
the cardiopulmonary health effects of ambient particles are
uncertain. We examined the cardiopulmonary health effects of
fine particles (PM2.5) from different pollution sources in
Beijing, China, among a panel of 40 healthy university
students. Study subjects were repeatedly examined for a series
of cardiopulmonary health indicators during three 2-monthlong
study periods (suburban period, urban period 1, and
urban period 2) in 2010.2011 before and after relocating
from a suburban campus to an urban campus with changing air
pollution levels and contents. Daily ambient PM2.5 mass
samples were collected over the study and measured for 29 chemical constituents in the laboratory. Source appointment for
ambient PM2.5 was performed using Positive Matrix Factorization, and mixed-effects models were used to estimate the
cardiopulmonary effects associated with source-specific PM2.5 concentrations. Seven PM2.5 sources were identified as traffic
emissions (12.0%), coal combustion (22.0%), secondary sulfate/nitrate (30.2%), metallurgical emission (0.4%), dust/soil
(12.4%), industry (6.9%), and secondary organic aerosol (9.9%). Ambient PM2.5 in the suburban campus had larger contributions
from secondary sulfate/nitrate (41.8% vs. 22.9%.26.0%) and metallurgical emission (0.7% vs. 0.3%) as compared to that in the
urban campus), whereas PM2.5 in the urban campus had larger contributions from traffic emissions (13.0%.16.3% vs. 5.1%), coal
combustion (21.0%.30.7% vs. 10.7%), and secondary organic aerosol (9.7%.12.0% vs. 8.7%) as compared to that in the
suburban campus. Potential key sources were identified for PM2.5 effects on inflammatory biomarkers (secondary sulfate/nitrate
and dust/soil), blood pressure (coal combustion and metallurgical emission), and pulmonary function (dust/soil and industry).
Analyses using another source appointment tool Unmix yielded a similar pattern of source contributions and associated health
effects. In conclusion, ambient PM2.5 in Beijing suburban and urban areas has two distinct patterns of source contributions, and
PM2.5 from different sources may play important roles on different aspects of PM2.5-related cardiopulmonary health effects.

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