When deciding where to place monitors, you should initially prioritise spaces that feel constantly stuffy or have a persistent smell as these are likely to be under-ventilated.
Wrth benderfynu ble i osod dyfeisiau monitro, i ddechrau dylech flaenoriaethu mannau sy'n teimlo’n ddiawel neu lle ceir arogl drwy'r amser ac sy'n debygol o fod heb eu hawyru'n ddigonol.