TVOC represents the total mass concentration of volatile organic compounds in indoor air, measured in micrograms per cubic meter or parts per billion. TVOC aggregates all measured VOCs including formaldehyde, terpenes, aldehydes, and hydrocarbons from building materials, furnishings, cleaning products, and human activity. Single TVOC values provide comprehensive indoor air quality assessment independent of individual compound identification.
Measurement and Standards
TVOC is measured using gas chromatography or photoacoustic spectroscopy over defined periods. GREENGUARD standards limit TVOC to 0.5 mg/m³ for certified products. Indoor TVOC concentrations typically range from 200-500 micrograms per cubic meter in conventional buildings and 50-200 in low-emission buildings. Outdoor baseline TVOC concentrations average 20-50 micrograms per cubic meter.
Practical Applications
TVOC measurement helps verify material selection and installation practices. Tracking TVOC levels during first weeks after renovation confirms off gassing patterns. HVAC systems with 15 CFM per person outdoor air and 50% efficient particle filters reduce TVOC concentrations by 30-40%. Regular ventilation and source control maintain TVOC below 300 micrograms per cubic meter for occupant comfort and health.