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Air changes per hour For odor-heavy rooms like kitchens or living rooms with pets, a purifier rated to deliver at least 4 to 5 air changes per hour in the room size is the right target

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Individuals with pre-existing respiratory conditions, such as asthma or chronic obstructive pulmonary disease (COPD), are particularly vulnerable to the adverse effects of PM2.5 exposure

However, rates of switching from high-risk to low-risk use have been relatively rapid in younger age groups (an unintentional public health success), but slower among older adults (a failure)

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