CO₂ Monitoring & Ventilation Compliance
Trusted since 1999 · Proven delivery partner
CO₂ concentration is the primary indicator of ventilation adequacy in occupied buildings. Green Air Monitoring provides CO₂ monitoring services — from spot checks to continuous logging — to verify that your ventilation system delivers sufficient fresh air to meet occupant needs and regulatory requirements.
Why CO₂ Matters
Elevated CO₂ levels indicate that the ventilation system is not providing adequate fresh air relative to occupancy. Above 1,000 ppm, cognitive performance measurably declines. Above 1,500 ppm, occupants commonly report stuffiness, fatigue, and difficulty concentrating.
- CIBSE Guide A recommends below 1,000 ppm for good air quality
- Building Regulations Part F requires adequate provision of fresh air
- WELL v2 requires CO₂ levels below 800 ppm above outdoor levels
- Elevated CO₂ reduces cognitive function by up to 50%
Our Monitoring Approach
We deploy calibrated NDIR CO₂ sensors at representative locations within your building. Spot measurements identify immediate issues, while continuous logging over 1–2 weeks captures patterns across different occupancy levels, seasons, and operating modes.
Reporting & Recommendations
Results are presented against CIBSE, Part F, and WELL benchmarks with clear visualisation of CO₂ profiles over time. Where levels exceed thresholds, we provide specific recommendations for ventilation rate adjustment, system modification, or operational changes.
Frequently Asked Questions
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Get a no-obligation quote. We provide IAQ testing, ventilation assessment and environmental monitoring across London and the South East.