December 4, 2025ToxicsOpen Access

Effectiveness of HEPA/Carbon Filter Air Purifier in Reducing Indoor NO2 and PM2.5 in Homes with Gas Stove Use in Lowell, Massachusetts

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Pre-test to post-test study shows HEPA air purifiers improved indoor air quality, reducing NO2 and PM2.5 levels in low-income homes over 12 months.

Geometric mean for NO2 decreased by 36% from 20.16 to 12.79 ppb, showing significant air quality improvement.
Indoor air quality was enhanced after introducing HEPA/carbon filter air purifiers in low-income homes after the 4th month.
Linear mixed models were applied to assess changes in NO2 and PM2.5 with significant air purifier use increase.
The findings suggest that air purifiers can effectively mitigate indoor air pollutants for health benefits.

Turcotte et al. (2025) studied this question.

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Pre-test to post-test study shows HEPA air purifiers improved indoor air quality, reducing NO2 and PM2.5 levels in low-income homes over 12 months.