Abstract:
BACKGROUND:The biological mechanisms involved in inflammatory response to air pollution are not clearly understood. OBJECTIVE:In this study we assessed the association of short-term air pollutant exposure with inflammatory markers and lung function. METHODS:We studied a cohort of 158 asthmatic and 50 nonasthmatic school-age children, followed an average of 22 weeks. We conducted spirometric tests, measurements of fractional exhaled nitric oxide (Fe(NO)), interleukin-8 (IL-8) in nasal lavage, and pH of exhaled breath condensate every 15 days during follow-up. Data were analyzed using linear mixed-effects models. RESULTS:An increase of 17.5 microg/m(3) in the 8-hr moving average of PM(2.5) levels (interquartile range) was associated with a 1.08-ppb increase in Fe(NO) [95% confidence interval (CI), 1.01-1.16] and a 1.07-pg/mL increase in IL-8 (95% CI 0.98-1.19) in asthmatic children and a 1.16 pg/ml increase in IL-8 (95% CI, 1.00-1.36) in nonasthmatic children. The 5-day accumulated average of exposure to particulate matter <2.5 microm in aerodynamic diamter (PM(2.5)) was significantly inversely associated with forced expiratory volume in 1 sec (FEV(1)) (p=0.048) and forced vital capacity (FVC) (p=0.012) in asthmatic children and with FVC (p=0.021) in nonasthmatic children. Fe(NO) and FEV(1) were inversely associated (p=0.005) in asthmatic children. CONCLUSIONS:Exposure to PM(2.5) resulted in acute airway inflammation and decrease in lung function in both asthmatic and nonasthmatic children.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Barraza-Villarreal A,Sunyer J,Hernandez-Cadena L,Escamilla-Nuñez MC,Sienra-Monge JJ,Ramírez-Aguilar M,Cortez-Lugo M,Holguin F,Diaz-Sánchez D,Olin AC,Romieu Idoi
10.1289/ehp.10926subject
Has Abstractpub_date
2008-06-01 00:00:00pages
832-8issue
6eissn
0091-6765issn
1552-9924journal_volume
116pub_type
杂志文章abstract::The gas phase reactions of carbanions with molecular oxygen in both its ground state (X3 sigma g-) and first electronically excited state (a1 delta g) have been studied by the flowing afterglow technique. Reactions include cleavage processes, charge transfer, hydride transfer, formation of hydroxide ion and processes ...
journal_title:Environmental health perspectives
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