The only certification our scoring is based on is Cradle to Cradle. The Health Product Declaration (HPD) and GreenScreen are both standards that we accept, but are not certifications.
To fill in a complete HPD, emissions testing/certifications are required if applicable. We accept a number of VOC emissions certifications, but they are not weighted at this point. Including them impacts whether you have a compliant HPD per the standard, which impacts your score, but the VOC certifications don't themselves contribute to the score.
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