Diesel fuel sold or offered for sale in the state for use in internal combustion engines must contain at least 5% biodiesel (B5) fuel by volume. Beginning May 1, 2012, diesel fuel must contain at least 10% biodiesel, and must contain 20% biodiesel by May 1, 2015. Diesel fuel sold during the months of April, May, June, July, August, September, and October are required to contain more than B5 and revert back to B5 for the following five consecutive months. However, the commissioners of agriculture and commerce and the Pollution Control Agency, in consultation with the Biodiesel Task Force and other technical experts, may allow the specified biodiesel blend level to be effective year round if determined that an ASTM specification or equivalent federal standard exists for the specified biodiesel blend level that adequately addresses technical issues associated with Minnesota's cold weather and publish a notice in the State Register to that effect. Additional exceptions may apply. (Reference Minnesota Statutes 239.75 and 239.77)