Measurement of particulate matter emission rates from mechanically ventilated swine barns

B. Z. Predicala, R. G. Maghirang

Research output: Contribution to journalArticlepeer-review


Methods for measuring emission rates of particulate matter (PM) from mechanically ventilated livestock buildings were evaluated in the laboratory using a test chamber. Particulate matter concentrations were measured inside the chamber and at the exhaust duct. Concentrations at the exhaust duct were determined using high-volume traverse downstream of the exhaust fan, low-volume traverse downstream of the fan, and fixed sampling upstream and downstream of the fan. The high-volume traverse was the reference method. Both traverse methods were conducted under isokinetic conditions; fixed sampling was done under both isokinetic and sub-isokinetic conditions. Both room sampling and exhaust sampling under sub-isokinetic conditions severely overestimated exhaust PM concentrations. The low-volume traverse and fixed sampling under isokinetic conditions agreed well with the high-volume traverse (mean difference ranging from 7% to 14%). Methods involving room sampling, fixed sampling at exhaust, and high-volume traverse at exhaust were also compared in a swine finishing barn. Room sampling overestimated concentrations at the exhaust by an average of 30%, and PM concentration from fixed sampling did not differ significantly (p > 0.05) from that of the high-volume traverse method. It appears that fixed sampling under isokinetic conditions can be used as an alternative to the high-volume PM traverse method to accurately measure PM concentrations at the exhaust, from which the PM emission rate can be determined.

Original languageEnglish (US)
Pages (from-to)557-565
Number of pages9
JournalTransactions of the American Society of Agricultural Engineers
Issue number2
StatePublished - Mar 1 2004
Externally publishedYes


  • Air pollution
  • Air quality
  • Dust
  • Emission
  • Measurement
  • Swine

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

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