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A comment on Air Quality Monitors Compared: AirGradient vs. Purple Air. Parent comment

Re:Air Quality Monitors Compared: AirGradient vs. Purple Air by pstrateman on Wednesday May 15, 2024 @03:19PM (#40371179)
If you're getting values lower then atmospheric then the readings are if by much more than 20 to 50 ppm.
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Re:Air Quality Monitors Compared: AirGradient vs. Purple Air by poulpy123 on Thursday May 16, 2024 @08:14AM (#40377366)
why ?
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