NollCO2 is a certification system for buildings developed by the Sweden Green Building Council and its member companies. NollCO2 uses the following criteria:
- NollCO2 sets requirements for projects to reduce climate impact by using carbon limit values for the product stages A1-A3, and for construction stages A4-A5.
- NollCO2 sets a requirement for reduced climate impact associated with operational energy use by using an operational energy limit for the building energy use stage B6.
- NollCO2 requires the project to balance the remaining climate impact with climate negative actions to attain net zero climate impact.