What does an indoor-air test before move-in establish?
An indoor-air test taken before furniture and residents arrive establishes the measured levels of the substances included in the test, in the sampled rooms and under the conditions recorded at that time. It can provide a baseline for the newly completed home. It does not predict occupied exposure: furnishings and daily activities can change pollutant sources, while ventilation conditions can change with system use. A building measurement answers a different question from a product emission test or a measurement made after people move in. [1] [2]
- An indoor-air result describes the substances measured in the sampled rooms during the stated sampling period; the report’s scope and conditions determine what it can establish. [1] [2]
- The German Environment Agency’s study examined volatile organic compounds and odours in energy-efficient buildings and tested about 60 products or material combinations in emission chambers, as well as in buildings or test rooms. [1]
- A study of 80 new homes in England included occupied-home monitoring; residents were asked to keep trickle ventilators open and use extract fans. The study also interviewed residents about pollutant sources and ventilation behaviour. [2]
- For a handover report, ask which substances and rooms were tested, how and when samples were collected, and what the report records about furnishing, ventilation, temperature and humidity. [2]
A result belongs to its sampling conditions
An indoor-air result applies to the substances, rooms and sampling period covered by the test. The report should make those limits clear. The German Environment Agency’s research examined volatile organic compounds and odours in energy-efficient buildings, real buildings before and after renovation, and building products and material combinations. It also compared odour-assessment methods for room-air samples. Those different evidence types answer different questions: a product tested in an emission chamber does not by itself establish what occupants will breathe throughout a completed home. [1]
What a pre-move-in measurement can show
A pre-move-in test can show whether the selected substances were detected, and at what levels, in the tested spaces at that stage. Its value depends on matching the test to the question: for example, a test focused on volatile organic compounds cannot establish the level of a substance it did not measure. The German Environment Agency report describes testing about 60 individual products and material combinations in emission chambers, with products also placed in new or refurbished buildings or assessed in real test rooms. Product tests and building measurements therefore provide related but distinct evidence. [1]
What an empty home leaves out
An empty-home measurement does not record the sources and behaviours that arise during occupation. Furniture and belongings may add sources; cooking and cleaning add activities; and ventilation depends partly on how equipment and openings are used. A 2019 English government study investigated 80 new homes during winter 2015 to 2016. It used several levels of monitoring: all 80 homes had ventilation-system inspections, 54 received limited monitoring, and 10 received detailed monitoring. During monitoring, householders were asked to keep trickle ventilators open and use extract fans. Researchers also interviewed residents about indoor pollutant sources, ventilation behaviour and their perceptions of air quality. The study’s occupied-home findings cannot be inferred from a handover sample taken before residents arrive. [2]
What to request with the handover report
Ask the tester to state which substances were analysed, which rooms were sampled, how long sampling lasted, and when it took place relative to installation and finishing work. Ask whether the home was furnished or occupied and what ventilation settings and operating conditions applied. Temperature and relative humidity are useful context to request where relevant: the English study measured both, alongside carbon dioxide, in its limited monitoring of homes. The study is an example of recorded monitoring conditions, not a universal handover protocol. A report that does not state its conditions leaves the reader less able to compare its result with the question they need answered. [2]
Treat it as a baseline, not a guarantee
A low result for the substances tested is evidence about those substances under the sampled conditions. It does not establish that unmeasured pollutants are absent, that every room is the same, or that future occupied exposure will match. Check that the substances tested address your concern and that the report states where and when sampling took place. If you need evidence about exposure after moving in, ask a qualified indoor-air professional whether a targeted measurement under representative occupied conditions would answer that separate question. [1] [2]