Effects of ultrafine and fine particles in urban air on peak expiratory flow among children with asthmatic symptoms.
作者： Juha Pekkanen , Kirsi L. Timonen , Juhani Ruuskanen , Auvo Reponen , Aadu Mirme
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摘要: Abstract It has been suggested that ultrafine particles in urban air may cause the health effects associated with thoracic (PM10). We therefore compared of daily variations different sizes on peak expiratory flow (PEF) during a 57-day follow-up 39 asthmatic children aged 7–12 years. The main source particulate pollution area was traffic. In addition to measurements PM10 and black smoke (BS) concentrations, an electric aerosol spectrometer used measure particle number concentrations six size classes ranging from 0.01 10.0 μm. Daily BS ranges between 0.032 0.32 μm 1.0 were highly intercorrelated (correlation coefficients about 0.9). Correlations somewhat lower (below 0.7). All these pollutants tended also be declines morning PEF. However, only statistically significant associations observed BS. Different time lags most consistently Therefore, present study children, concentration no more strongly PEF than or BS, as earlier suggested.
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