The Carpet and Rug Institute (CRI) uses scientific methods such as airborne dust mass measurement to determine the amount of dust vacuum cleaners release into the air. According to CRI, the best vacuums - those receiving CRI's Seal of Approval (SOA) - strictly control dust output resulting in only 35 - 100 micrograms of airborne dust per cubic meter of air.
The CRI Seal of Approval (SOA) Program awards vacuum cleaners Bronze, Silver or Gold recognition based on these dust containment levels:
- Bronze
- ≤ 100 µg/m3 (dust particles)
- Silver
- ≤ 100 µg/m3 (dust particles)
- Gold
- ≤ 35 µg/m3 (dust particles)