Previous work concluded that stationary agricultural internal combustion (IC) engines are a substnatial source of criteria pollutants the San Joaquin Valley (SJV)~1. However, due to time and resource resitrictions, earlier work did not include a rigorous survey of engine users. Instead, emission estimates were based on interviews with a few knowledgeable experts (e.g., Department of Agriculatural Engineering at U.C.Davis, the Agriculture Extension office of U.C.Davis, Farm Bureau, and Water District offices) or were extrapolated from data designed for other purposes. The purpose of the current study, which was sponsored by the San Joaquin Valley Unified Air Pollution Control District, was to improve the estimate of emissions from this source category by conducting a more comprehensive inventory of this source type based on data collected via a telephone survey of engine users. Theer survey data were then used to estimate and seasonally allocate emissions for this source category. The findings of this current work show that these emissions are much lower than previously estimated.
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