The BAAQMD adopted new guidance on June 2, 2010 to address greenhouse gas emission thresholds related to operational related emissions from stationary sources and projects other than stationary sources. Stationary sources are allowed to emit up to 10,000 metric tons (MT) e/year. Other projects are allowed to emit 1,100 MT of e/yr; 4.6 MT e/SP/yr; or compliance with a qualified greenhouse gas reduction strategy. The BAAQMD has not established construction related emissions thresholds, deferring this responsibility to the CEQA lead agency. Chapter 8.2 of the BAAQMD Air Quality Guidelines recommends lead agencies quantify construction emissions and assess if they conflict with AB 32 goals. BAAQMD also recommends using URBEMIS air modeling software to calculate GHG emissions on land use changing projects, and RoadMod software for linear projects. BAAQMD recommends analysis of operational emissions in the five step process: eliminate greenhouse gas analysis if project attributes do not pass screening criteria, quantify emissions using appropriate models, compare unmitigated emissions with thresholds of significance, implement mitigation measures if project is over thresholds of significance, then compare emissions again with thresholds of significance. South Coast Air Quality Management District The South Coast Air Quality Management District has developed a tiered analysis process for determining the significance of project-related GHG emissions. If a project is not categorically or otherwise exempt, and if it cannot be shown that the GHG emissions from the project are within GHG budgets in approved regional plans, then project applicants are required to show that the project GHG emissions are below, or mitigated to less than, the applicable following significance screening level: 10,000 metric tons of e per year for industrial projects; or 3,000 metric tons of e per year for commercial or residential projects Impact mitigation measures Lead agencies can implement several different mitigation measures to offset or reduce GHG emissions. The BAAQMD recommends using the following best management practices for construction activities: 15% of project's heavy equipment and transportation fleet run on alternative fuels and/or electricity, recycling or reusing 50% of demolition waste, and using 10% local of building materials. Other measures used to reduce construction emissions include limiting equipment idle time, car pooling, and purchase and retire of offsite carbon credits. BAAQMD recommends lead agencies mitigate operational emissions by adopting a qualified GHG Reduction Strategy that is consistent with AB 32. This strategy can be incorporated into the lead agency's general plan or programmatic level policy for