/industries/refining/b/weblog/posts/improve-gasoline-blending-to-achieve-epa-tier-3-regulationsFor U.S. refineries that produce more than 75M barrels per day, the Environmental Protection Agency’s Tier 3 regulations , which mandate reduced gasoline sulfur content, come into effect in 2017. For smaller refineries, these regulations take effect inen-USTelligent Community 13