(a) Except as provided in subsection (b) of this section, not later than September 1, 2010, each full-sized school bus with an engine model year of 1994 or later transporting children in the state shall either: (1) Be equipped with a closed crankcase filtration system and either a level 1 device, level 2 device or level 3 device, or, if the bus has an engine model year of 2003 to 2006, inclusive, has not been retrofitted with a level 1 device or level 2 device prior to July 1, 2007, and is capable of operating normally with a level 3 device that can be installed along with a closed crankcase filtration system for five thousand dollars or less in accordance with a procurement contract developed pursuant to subsection (c) of this section, be equipped with a closed crankcase filtration system and a level 3 device, (2) be equipped with an engine certified by the federal Environmental Protection Agency to meet model year 2007 emission standards, or (3) use compressed natural gas or other alternative fuel certified by the federal Environmental Protection Agency or the California Air Resources Board to reduce particulate matter emissions by not less than eighty-five per cent compared to ultra-low sulfur diesel fuel.

(b) The provisions of subsection (a) of this section shall not apply if the procurement contracts developed pursuant to subsection (c) of this section fail to establish a price level for the purchase, installation and warranty of a closed crankcase filtration system, and either a level 1 device, level 2 device or level 3 device in each type of full-sized school bus that is equivalent to or less than the grant amount for such emissions control device specified in subsection (a) of § 22a-21j.

(c) The Commissioner of Administrative Services, in consultation with the Commissioner of Energy and Environmental Protection, shall develop procurement contracts, in accordance with chapter 58 for (1) level 1, level 2 and level 3 devices, and (2) closed crankcase filtration systems, including the installation and warranty of such devices and such systems. Said procurement contracts shall be made available to state agencies and political subdivisions of the state through the contracting portal section of the Department of Administrative Services’ Internet web site.