Low to Zero Concentrations of Airborne Bacterial Pathogens and Indicator <i>E. coli</i> in Proximity to Beef Cattle Feedlots in Imperial Valley, California.

In contrast, when wind direction was categorized as 90° partitions of either (1) downwind, (2) side or upwind of the feedlot, or (3) little to no wind (<1.8 m/s or <4 mph), in this case, wind direction relative to the feedlot was not significant for Model A2 (in situ weather), but it was highly significant for Model A4 (weather station).

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