Journal
INDOOR AIR
Volume 30, Issue 2, Pages 213-234Publisher
WILEY
DOI: 10.1111/ina.12621
Keywords
air quality sensors; building simulation; exposure monitoring; Indoor Air Quality; low-cost sensors; smart buildings
Categories
Funding
- ASHRAE [ASHRAE 1756-RP]
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Low-cost airborne particle sensors are gaining attention for monitoring human exposure to indoor particulate matter. This study aimed to establish the concentrations at which these commercially available sensors can be expected to report accurate concentrations. We exposed five types of commercial integrated devices and three types of bare low-cost particle sensors to a range of concentrations generated by three different sources. We propose definitions of upper and lower bounds of functional range based on the relationship between a given sensor's output and that of a reference instrument during a laboratory experiment. Experiments show that the lower bound can range from approximately 3 to 15 mu g/m(3). At greater concentrations, sensor output deviates from linearity at approximately 300-3000 mu g/m(3). We also conducted a simulation campaign to analyze the effect of this limitation on functional range on the accuracy of exposure readings given by these devices. We estimate that the upper bound results in minimal inaccuracy in exposure quantification, and the lower bound can result in as much as a 50% error in approximately 10% of US homes.
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