EPA is proposing to approve a State Implementation Plan (SIP) revision submitted by the Commonwealth of Pennsylvania. This SIP revision amends Pennsylvania's prior, Federally approved enhanced vehicle inspection and maintenance (I/M) SIP, in particular to the I/M test type to apply to sixteen counties (Berks, Blair, Cambria, Centre, Cumberland, Dauphin, Erie, Lancaster, Lackawanna, Lebanon, Lehigh, Luzerne, Lycoming, Mercer, Northampton and York). Pennsylvania had previously adopted (but did not commence) a different form of testing for these counties, which EPA previously SIP-approved. Pennsylvania's revised SIP: Incorporates onboard diagnostic computer system checks for vehicles equipped with second generation onboard diagnostic systems (OBD-II) in the 8-county South Central Region (comprised of Berks, Dauphin, Cumberland, Lancaster, Lebanon, Lehigh and York Counties); applies different I/M test requirements for the South Central Region versus the 8-county Northern Region (comprised of Blair, Cambria, Centre, Erie, Lackawanna, Luzerne, Lycoming and Mercer Counties) in
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