Indoor air quality #4: Project: Indoor air quality in New Zealand homes and garages (October 2019)

The indoor air quality of seven homes in the Wellington region was monitored over May-September 2017. The houses represented different ages and construction types. Airtightness was found to be correlated with house age, with the older houses having higher natural ventilation/air leakage. Indoor airborne particulates were generally higher than outside, mostly generated from cooking and wood burners. Outdoor air pollution infiltrates indoors unimpeded. Most occupied bedrooms had higher levels of carbon dioxide than recommended due to poor ventilation when occupied.