allowed on State authority  on a case-by-case basis. Such allowances must also not cause exacerbate a violation of the NAAQS nor impeded an area’s attainment strategy in any way.  Under General Conformity, the state agency responsible for preparing the SIP can allow either  an area-wide or local-scale dispersion assessment of CO or PM as a means of demonstrating  General Conformity. The results of the air quality modeling  must show that the action does not  cause or contribute to any new violation of any  NAAQS in any area and does not increase the  frequency or severity in any area.  If direct and indirect emissions attributable to an action cannot be identified in an approved SIP,  cannot be demonstrated via air quality modeling that a violation or exacerbation of the NAAQS  would not be incurred, and/or cannot be mitigated or offset to zero, the only remaining option to  demonstrate General Conformity is to petition the state Governor (or their designee) to revise the  SIP. The Governor or their designee (i.e., the air agency) must then  submit a commitment to  EPA providing the following:  Generally speaking, a SIP  including the commitments above must be submitted to EPA for  approval within 18 months of the Conformity Determination and the agency cannot undertake  the action prior to final approval of the SIP revision by EPA.  When a Draft General Conformity Determination is prepared, public and agency involvement  is  required. The Draft must be advertised via public notice in a daily newspaper of local circulation  and air quality stakeholders (including EPA, state/local air quality government, and the general  public) are allowed to provide comment for a 30- day period. The General Conformity Rule  allows for this comment period to run concurrent with any other public involvement, including  8.1.3.  Interagency and Public Review  • A specific schedule for adoption and submittal of a revision to the SIP which achieve the needed emission reductions prior  to the time emissions from the f ederal  action would occur;  • Identification of specific measures for incorporation into the SIP which would result in a  level of emissions which, together with all other emissions in the nonattainment maintenance area, would not exceed any emissions budget specified in the applicable  SIP;  • A demonstration that all existing applicable SIP requirements are being implemented in  the area for  the pollutants affected by the federal action, and that local authority implement additional requirements has been fully pursued;  • A determination that the responsible f ederal agencies have required all reasonable  mitigation measures associated with their action; and  • Written documentation including all air quality analyses supporting the conformity  determination.  76$_{ }$ 8.1.2.3.  Air Quality Modeling for CO and PM  8.1.2.4.  Commitment to Revise the SIP  Aviation Emissions and Air Quality Handbook 