WELL, RESET, LEED: building-level certifications

Three certifications drive most commercial indoor-air decisions in North America, and each evaluates buildings against a different rubric. WELL (International WELL Building Institute) is a health-focused building standard organized in ten concepts: air, water, nourishment, light, movement, thermal comfort, sound, materials, mind, and community. Its air concept covers ventilation, filtration, source control, and air-quality monitoring.

RESET Air is data-driven: it is built around continuous monitoring of indoor air, including PM_2.5, CO₂, TVOC, temperature, and humidity, with the data reported on an ongoing basis. Certification depends on measured performance over time, not on installed equipment, and RESET sets its own requirements for the monitors a project uses. For tenants, "RESET Air Certified" means ongoing measured performance, not a one-time inspection.

LEED (U.S. Green Building Council) is the broadest of the three: a sustainability rating in which indoor environmental quality is one credit category, covering design choices such as ventilation, low-emitting materials, and filtration. Building codes are a separate layer: California's Title 24 Building Energy Efficiency Standards, for example, set requirements for how buildings are designed, including ventilation.

Certification programs and codes cover project scope, installation location, calibration, data handling, reporting, commissioning, governance, and sometimes monitor accreditation. A good sensor stack supports the measurement layer, but it cannot replace those process requirements, and a room monitor does not make a building certified or code-compliant. That is why Terrestream separates capability from certification language: it can speak to PM, CO₂, humidity, temperature, VOC index, and NO_x index data, and it does not claim RESET accreditation, WELL certification, or code compliance.

For commercial teams, continuous room data can support a project's own monitoring and verification work, as long as the program's accepted monitors, installation, and reporting rules are followed. For the details, see Accreditation, Sensor compliance, and the RESET and WELL VOC pathway on the Measurement Evidence page, which explains Sensirion's laboratory method for relating the VOC index to TVOC and why it is not a field conversion or a certification.