(a) As used in this section and sections 14-164o, 22a-21j and 22a-21k:

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(1) “Closed crankcase filtration system” means a system that separates oil and other contaminants from the blow-by gases and routes the blow-by gases into a diesel engine’s intake system downstream of the air filter;

(2) “Emergency contingency vehicle” means a bus placed in an inactive contingency fleet for local emergencies, after the bus has reached the end of its normal minimum useful life;

(3) “Full-sized school bus” means a school bus, as defined in section 14-275, which is a Type I diesel school bus, including spare buses operated by or under contract to a school district, but not including emergency contingency vehicles or low usage vehicles;

(4) “Low usage vehicle” means a bus that operates for not more than one thousand miles per year;

(5) “Model year 2007 emission standards” means engine emission standards promulgated by the federal Environmental Protection Agency in 40 CFR Parts 69, 80 and 86;

(6) “Ultra-low sulfur diesel fuel” means diesel fuel used by an on-road engine that meets the requirements for sulfur content set forth in 40 CFR 80;

(7) “Verified emissions control device” means a device that has been verified by the federal Environmental Protection Agency or the California Air Resources Board to reduce particulate matter emissions by a given amount;

(8) “Level 1 device” means a verified emissions control device that achieves greater than or equal to twenty-five per cent, but less than fifty per cent, particulate matter reduction;

(9) “Level 2 device” means a verified emissions control device that achieves greater than or equal to fifty per cent, but less than eighty-five per cent, particulate matter reduction; and

(10) “Level 3 device” means a verified emissions control device that achieves greater than or equal to eighty-five per cent particulate matter reduction or a particulate matter emission standard of 0.01 grams per brake horsepower-hour.