Abstract
Almond harvest accounts for a significant amount of PM10 emissions in California each harvest season. This article addresses the reduction of blower passes during the harvest from 3 to 1 as a possible mitigation measure. Ambient total suspended particulate and PM10 sampling was conducted at two orchards during harvest with alternating control and experimental treatments. On-site meteorological data were used in conjunction with inverse dispersion modeling using Industrial Source Complex Short-Term, version 3 (ISCST3) to develop emission rates from the measured concentrations. Baseline emission factors of 379 86 kg PM10 km-2 year-1 and 16 3.3 kg PM2.5 km-2 year-1 were determined, and an emissions reduction of 49% was achieved by the experimental treatment, representing a significant potential for emissions reduction across the state. Harvest efficiency was also measured to determine the possible financial impacts from a crop removal aspect. The results of the harvest efficiency work were variable, but the amount of unharvested product left in the orchard was small.
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