CSS	Chirp spread spectrum
E-nose	Electronic nose
FCC	Federal Communications Commission
IDC	International Data Corporation
IGSS	Intelligent gas sensor system
IoT	Internet of Things
ISM	Industrial, scientific, and medical
LPWAN	Low-power wide-area networks
LoRa	Long range
MSE	Mean squared error
RF	Radio frequency
RF	Random Forest
RSSI	Received signal strength indicator
SNR	Signal-to-noise ratio
SLDA	Standardized linear discriminant analysis
SPI	Serial peripheral interface
VOCs	Volatile organic compounds