Striking a balance between good air quality and good comfort levels should be at the centre of any indoor air quality strategy.

Temperature and humidity both have significant impacts on occupant comfort and wellbeing - and both are adversely affected by increased ventilation. Uncomfortable temperatures affect concentration, productivity and cause general discomfort. Low humidity, which can occur when ventilation and/or heating dry out the surrounding air, can provoke skin symptoms, nasal dryness and congestion. Excess humidity, meanwhile, encourages the production of dust mites and mould, leading to respiratory problems.

Dual-channel data loggers that measure both temperature and relative humidity can be used to simultaneously measure both parameters. Like CO₂ data loggers, these should be placed away from openings, such as windows and doors (where draughts can affect the accuracy of readings), and in a location that is representative of overall conditions.

The data can be compared and contrasted with data gathered from CO₂ monitoring to identify a correlation (or lack thereof) between ventilation rates and temperature and humidity levels.

Results from concurrent CO₂, temperature and humidity monitoring can then be used to inform a well-rounded ventilation strategy that prioritises air quality and comfort. Suitable strategies could include regularly ventilating rooms between periods of occupancy so that occupants are less affected by changes in ambient conditions. Any strategies that are implemented should be evaluated with further monitoring to determine their efficacy.

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References and further reading