One of the many possible ways to arrange various sensors: the PMS3003 is fixed on the baseplate, while the IRC-A1, the BME280, and the support board for the COB4, NO2B43F, and the OXB431 by Alphasense are fixed back the lid. Holes for exposing the sensors to the external environment along with mounting holes have been drilled in the enclosure lid in the proper position, depending on the specific sensor.