The requirement for high-quality mechanical ventilation systems in order to meet the standard can help to provide a good indoor air quality, but beyond this indirect effect, there are no other environmental criteria involved.
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A split occurred between the German and American branches of Passive House, resulting in two different groups offering certification in the United States and Canada: the North American Passive House Network (using the original German standards), and the Passive House Institute US (PHIUS, using a modified version of the original standard). PHIUS claims “more than 1 million square feet across 1,200 units nationwide”; interest and use of both certifications has been growing quickly in North America since first being introduced in 2003.
Only qualified consultants can purchase the Passive House Planning Package software, and project teams must work with a consultant to achieve certification.
The R-2000 program is a Canadian government initiative from the early 1980s that was designed to promote energy efficiency in homes. It has developed over time to include increasing energy efficiency standards and some degree of additional environmental responsibility.