Indoor Exposure to Fine Particulate Matter and Practical Mitigation Approaches Proceedings of a Workshop (2022) / Chapter Skim
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10 Workshop Summary and Closing Reflections
10 Workshop Summary and Closing Reflections
Pages 117-122
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From page 117... ...
Contributing to the complexity of the system are significant temporal variations for sources and indoor concentrations of PM2.5, as well as significant spatial gradients, both outdoors and indoors. There are also differences in how occupants perceive indoor air quality and how they behave and respond, as well as different policies that affect how indoor PM2.5 is handled.
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From page 118... ...
• Relative humidity affects the water content of PM2.5, which can change the size of the particles as well as the chemistry and micro biology in and on the particles. It is not known what the optimum environmental conditions are to reduce the health effects of PM2.5.
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From page 119... ...
• Increases in indoor PM2.5 are associated with increases in asthma and chronic obstructive pulmonary disease morbidity, but portable HEPA filtration can reduce symptoms. • There is some evidence from animal studies that PM2.5 of indoor origin produces more inflammation and cytotoxicity than PM2.5 of outdoor origin.
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From page 120... ...
These studies are limited in number, and there is a need to do better at communicating the benefits of improved filtration and develop standards to help individuals realize those benefits. MITIGATION OF INDOOR PM2.5 Moving on to the presentations on approaches to mitigating indoor PM2.5, Corsi listed the following highlights: • Local exhaust of emissions from cooking, a major source of indoor PM2.5, can be achieved with a range hood, downdraft exhaust sys tem, ceiling or wall exhaust, or open window.
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From page 121... ...
• There are substantial exposure and health disparities related to socioeconomic status, with underserved communities carrying a high burden due to proximity to outdoor sources, higher occupant density, older ventilation and exhaust systems, and economic chal lenges that affect the use of practical mitigation approaches. Other factors, like the amount of time spent in the home and cooking practices, also affect exposure.
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