FIGURE 7-6 TERP NOx emission reductions to date versus the 2007 SIP TERP goal in the HGB area. Source: Chan et al. 2005. Reprinted with permission; copyright 2005, ENVIRON.

industry. Manufacturers and fire safety officials have raised safety concerns about widespread use of heat-generating catalysts on lawn and garden equipment. Safety studies beyond normal EPA and CARB practices are ongoing; the committee did not have enough information to assess safety concerns fully.

  • As a result of a 2003 law passed by Congress, small SI engines form a new regulatory category different from other mobile sources. California may set a second standard for those sources; however, the California standard for small SI engines is the only California standard that other states may not adopt under CAA section 177.

  • Some states have devised nonregulatory, incentive-based emissions-control programs for mobile sources. These programs to date have provided emissions control from mobile sources that would not otherwise have been provided by regulation.

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