Table 1.

Input devices used in the air station of the Kestrel system.

Device	Type	Comments
Kestrel-specific devices
gas sensor	Waveshare MQ-135 (Waveshare Electronics, Shenzhen, China)	NH${}_3$, NO${}_x$, alcohol, benzene, smoke, CO${}_2$, and other gases
temperature and humidity sensor	Measurement HTU21D (Measurement Specialties, Hampton, VA, USA)	fast response sensor
PM2.5	Seeed Studio HM3301 (Seeed Technology Co. Ltd., Shenzhen, China)	laser sensor, particle size: 2.5 $\mathsf{\mu }$m, 5 $\mathsf{\mu }$m, 10 $\mathsf{\mu }$m
framework devices
4K camera	Manta MM9359FS (Manta S.A., Warsaw, Poland)	live streaming via USB
positioning module	Waveshare SIM7000E (Waveshare Electronics, Shenzhen, China)	NB-IoT LTE GPS HAT