A peak expiratory flow rate (PEFR) measures how effectively you exhale. Also called a peak flow meter, this handheld device helps you document the amount of air and the speed at which you can ...
Journal of Public Health, Vol. 37, No. 3 (September 2015), pp. 455-460 (6 pages) Background The use of biomass fuel for cooking in traditional cookstove designs negatively affects respiratory health ...
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