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Sherif Karama, a psychiatrist at McGill University in Canada who led the observational study, told Mic

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Declines were less marked among older age groups, and more variable from year to year

Learn more about sensor evaluation for indoor environments: Consumer Indoor Air Sensors Evaluation Lawrence Berkeley National Laboratories Indoor Program Air Quality Sensors Lawrence Berkeley National Laboratories research article, "Performance assessment of low-cost environmental monitors and single sensors under variable indoor air quality and thermal conditions" Lawrence Berkeley National Laboratories research article "Performance of low-cost indoor air quality monitors for PM2.5 and PM10 from residential sources" Does EPA make recommendations on low-cost air pollution monitors available on the market for indoor use