title: Fine particles and peak flow in children: acidity versus mass.
abstract: We assessed the impact of summertime haze episodes on twice daily peak flow measurements of children in Philadelphia, Pennsylvania. Height-adjusted peak flows were regressed on weather and air pollution concentrations. Lower morning peak flows were associated with exposure to inhalable particulate matter (-2.94 liters/minute/18 microg/m3, 95% confidence limits (CL) = -0.56, -5.33), and fine sulfate particles (-2.44 liters/minute/8 microg/m3, 95% CL = -0.36, -4.51). Particle-strong acidity and the coarse particle mass were weakly associated with lower peak flow. Acutely lower peak flows in children were associated with fine sulfate particles, but only weakly with the acidity of the fine particles.
authors.affiliation: Department of Environmental Health, Harvard School of Public Health, Boston, MA 02115, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Neas
authors.forename: D W
authors.initials: DW
authors.lastname: Dockery
authors.forename: P
authors.initials: P
authors.lastname: Koutrakis
authors.forename: F E
authors.initials: FE
authors.lastname: Speizer
mesh_terms: D000397:Air Pollution / Q000009:adverse effects / Q000032:analysis / Q000706:statistics & numerical data; D002648:Child; D016001:Confidence Intervals; D004781:Environmental Exposure / Q000009:adverse effects / Q000032:analysis / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D010126:Ozone / Q000009:adverse effects / Q000032:analysis; D010316:Particle Size; D010366:Peak Expiratory Flow Rate; D015143:Philadelphia / Q000453:epidemiology; D012044:Regression Analysis; D012120:Respiration Disorders / Q000453:epidemiology*; D013431:Sulfates / Q000009:adverse effects / Q000032:analysis
chemical_list: D013431:Sulfates; D010126:Ozone