Table 1.

Information about sensors (accessed on 30 January 2024).

Sensor	Manufacturer	Model	T90	Range	URL	Principle of Measurement	Detailed Specification
CO	DFRobot	SEN0466	≤30 s	0–1000 ppm	https://www.dfrobot.com/product-2508.html	Electrochemical -lack detailed information about specific chemical reactions	https://dfimg.dfrobot.com/nobody/wiki/5953b463b8712f03d0791e98dd592e78.pdf   https://wiki.dfrobot.com/SKU_SEN0465toSEN0476_Gravity_Gas_Sensor_Calibrated_I2C_UART
NO2	DFRobot	SEN0471	≤30 s	0–20 ppm	https://www.dfrobot.com/product-2515.html
NH3	DFRobot	SEN0469	≤150 s	0–100 ppm	https://www.dfrobot.com/product-2513.html
SO2	DFRobot	SEN0470	≤30 s	0–20 ppm	https://www.dfrobot.com/product-2514.html
H2S	DFRobot	SEN0467	≤30 s	0–100 ppm	https://www.dfrobot.com/product-2511.html
O2	DFRobot	SEN0465	≤15 s	0–25% vol	https://www.dfrobot.com/product-2510.html
O3	DFRobot	SEN0472	≤120 s	0–20 ppm	https://www.dfrobot.com/product-2516.html
VOC	DFRobot	SEN0394	≤30 s	1–500 VOC index	https://www.dfrobot.com/product-2251.html	MOX Sens (patent pending Sensirion)	https://dfimg.dfrobot.com/nobody/wiki/e0d14f074941edff71a2368e8ee2ee76.pdf
CO2	DFRobot	SEN0159	≤3 s	350–10,000 ppm	https://www.dfrobot.com/product-1023.html	Electrochemical -lack detailed information about specific chemical reactions	https://image.dfrobot.com/image/data/SEN0159/CO2b%20MG811%20datasheet.pdf
PM	AlphaSense	OPC-N3	≤3 s	0.35–40 μm; 0–2000 μg/m3	https://www.alphasense.com/products/optical-particle-counter/	Optical	https://www.alphasense.com/wp-content/uploads/2022/09/Alphasense_OPC-N3_datasheet.pdf