Background: The adverse effects of Asian dust (AD) on health have been demonstrated in earlier studies, but there is no standardized definition for heavy-AD. This study aimed to examine which definition of heavy-AD has the most adverse effect on respiratory function.
Methods: One-hundred-and-thirty-seven adults with asthma, and 384 school children self-measured their morning peak expiratory flow (PEF). The four definitions of heavy-AD are: (1) the definition provided by the Japan Meteorological Agency (JMA), (2) daily median AD particle level ≥ 0.07 km, obtained through light detection and ranging (LIDAR) (3) hourly AD particle level ≥ 0.1 km, and (4) hourly level ≥ 0.07 km. Linear mixed models were used to estimate the effects of heavy-AD, by definition type, on daily PEF values.
Results: In adults with asthma, as per the JMA's definition, significantly reduced PEF were observed on heavy-AD days (lag 0), lag 0-1, and lag 0-3. In school children, after a heavy-AD event, as defined by the JMA, PEF significantly decreased on lag 0-1, lag 0-2, and lag 0-3. However, as per the other definitions, there was no significant decrease in the PEF in the adults and children.
Conclusion: The associations between heavy-AD and respiratory function differed between these definitions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664575 | PMC |
| http://dx.doi.org/10.1186/s41021-017-0085-9 | DOI Listing |
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