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Table 12 Indoor air quality standards

From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things

Items Critical concentration
Indoor Air Quality (IAQ)
Carbon dioxide (CO2) 1000 ppm
Carbon monoxide (CO) 9 ppm
Formaldehyde (HCHO) 0.08 ppm
Total volatile organic compound (TVOC) 0.56 ppm
Bacteria 1500 CFU/m3 (bacterial counts/cubic meter)
PM2.5 35 μg/m3