The one that may require more attention is manure pits under the barn floor. The source of odors from a manure pit is the volatile compounds generated during the decomposition of manure. The techniques for odor and gas control inside swine confinement barns are limited. The most effective odor control is to exhaust all the air for the cold and mild weather rates through the pit. With a properly operating ventilation system the hydrogen sulfide concentrations of less than 3 ppm can be achieved at all locations inside a barn while exhaust air levels varied from 40 to 110 ppm.
Dust can carry gases and odors.
Dust from swine barns originates from feed, bedding material, manure and the animals themselves. The factors determining the amount of dust in confinement includes animal activity, temperature, relative humidity, ventilation rate, stocking density and feeding methods. Therefore using best management practices to reduce the dust in and around a barn will reduce the odors. Other possible techniques to control odor are through adding chemical or biological compounds. 1. masking agents that override the offensive odors.