BRP announced the company has ten 2012 Ski-Doo snowmobile models certified for use in Yellowstone and Grand Teton National Parks where some of the toughest emission standards are enforced. Snowmobiles must be certified as Best Available Technology (BAT) by the National Park Service to enter Yellowstone and Grand Teton National Parks. BAT certification is one of the most stringent standards for air and noise emissions in the world, requiring hydrocarbon emissions of less than 15 g/kW-hr, carbon monoxide emissions of less than 120 g/kW-hr, and sound level limited to 73 decibels. These ten Ski-Doo snowmobiles are all equipped with four-stroke engines, either the ultra-quiet and efficient Rotax ACE 600 engine or the more powerful Rotax 4-TEC 1200 powertrain. The certified Ski-Doo snowmobiles require no modifications or throttle limiters to meet the BAT standards. "BRP is committed to providing responsible recreational products that meet or exceed our customer's needs while being as environmentally friendly as possible," said Robert Lumley, vice-president, Sales and Marketing, Ski-Doo and Sea-Doo. Ski-Doo models certified for BAT are offered in one-rider and two-rider configurations, including: the Grand Touring SE, Grand Touring LE with the Rotax 4-TEC 1200 engine, and the Grand Touring Sport, MX Z Sport, MX Z TNT, Renegade, Tundra LT, Tundra Sport, Expedition Sport, and Skandic WT, all equipped with the Rotax ACE 600 engine.