In California, the California Environmental Protection Agency Air Resources Board (ARB) refers to lawn mowers, garden and other outdoor power equipment equipped with spark-ignition engines as “small off-road engines,” the acronym being SORE. For the record, the power rating of such is limited to 25 horsepower max.
Now, add to this that in the Golden State, this equipment (with spark-ignition engines) totals 16.5 million units, outnumbering in-state registered light-duty vehicles by 2.8 million, according to the ARB, the air regulatory agency further relating that said lawn and garden equipment accounts for 76 percent of the total (12.6 million units); while construction