Indoor air quality compliance: the evidence each rule asks for
Air quality rules increasingly ask for continuous measurement, not a one-off survey. Aqueduct measures CO2, particulates, VOC, temperature and humidity per zone, tracks exposure in zone-hours against occupancy, and keeps the record your auditor or consultant needs.
A survey on a quiet day is not evidence of a healthy building.
Why air quality is hard to prove
- Snapshots miss the problem
A test during a shutdown or a quiet weekend says nothing about a full room at 3 pm.
- Duration matters
Risk comes from a level sustained over time, so a peak reading alone is not the measure.
- Occupancy changes the meaning
High CO2 in an empty room is irrelevant. The same reading with a full room is a breach.
Rules now asking for measured air
England Approved Document F: new non-domestic buildings should provide a means of monitoring IAQ, such as CO2 monitors.
Source: UK Approved Document F, 2022France: creches and schools need an annual ventilation assessment with a direct-reading CO2 measurement.
Source: Décret 2022-1689, Ineris AIDAthe CO2 alert level for CalSHAPE-funded California classrooms.
Source: California Energy Commission, CalSHAPEFrom reading to record
Zone the building
Sensors are placed so each zone is the area one sensor speaks for, on the real floor plan.
Overlay occupancy
Readings are judged against whether people were present, from sensors or schedules.
Rate and recommend
Each finding names the standard behind it and a costed action, such as raising outdoor air while the weather is mild.
Keep the record
Exposure in zone-hours and every excursion are exported as evidence for the program you report to.
Measures auditors and occupants care about
| Metric | What it tells you | Act when |
|---|---|---|
| CO2 exposure in zone-hours | Sustained poor ventilation | Exposure rises week on week. |
| Occupied hours over threshold | Breaches that affect people | Any zone breaches during occupancy. |
| PM2.5 and VOC excursions | Sources such as cleaning or wildfire smoke | A repeating daily pattern appears. |
| Sensor health | Whether the record is complete | Connection or battery falls low. |
sites in 21 countries run on Aqueduct.
and 9 clinics in one of India’s top hospital chains.
US airport running water intelligence on Aqueduct.
of commercial real estate under Aqueduct.
FMCG manufacturing campus.
operations run on Aqueduct.
Related
Common questions
No. Aqueduct supplies continuous measurement and exports per zone. Your team or consultant runs the program, interprets the rule and files any report, using the record as evidence. See ASHRAE 62.1.
ASHRAE 62.1 and 241, WELL, LEED, England Approved Document F and the French school ventilation decree, among others. Thresholds are set per site to match the rule you follow. See WELL.
Yes, through demand-controlled ventilation rules on connected air handlers, once the owner has approved control. Otherwise Aqueduct recommends the change, such as more outdoor air in a crowded zone, and the team applies it. See HVAC energy optimization.
One visit a year captures one afternoon, often a quiet one. Aqueduct logs each occupied hour instead, which shows the building as people actually use it, week after week. See aQ AirSafe.
See Aqueduct on your own facility.
Bring a site, a utility bill or a question. We will show you where the loss is.