Experimental study of indoor and outdoor airborne bacterial concentrations in Tempe, Arizona, USA

Hong Zhu, Patrick Phelan, Tianhua Duan, Gregory Raupp, Harindra J S Fernando, Fengxiang Che

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Indoor and outdoor airborne bacterial concentrations were examined in an occupied office building equipped with an air conditioning (HVAC) system, in Tempe, Arizona, USA. A two-stage microbial air sampler was used to collect bacteria both inside and outside the office at fixed locations in space, and at regular time intervals from August to December, 2000. Simultaneous measurement of bacterial concentrations, temperature, relative humidity, light intensity and wind speed were performed to explore the effects of environmental factors on bacteria levels. Ten genera and twenty species of airborne bacteria were found in our samples. Airborne Gram-positive bacteria were most abundant, with more than 90% of the measured population. The particle sizes of most outdoor and indoor airborne bacterial aerosols were larger than 8.0 μm. According to the measurements of either a typical day or three consecutive days, the concentrations of outdoor airborne bacteria were highest in the morning, but declined in the afternoon and reached the lowest point in the evening. With regard to the effects of four environmental factors - temperature, relative humidity, light intensity, and wind speed, the relative humidity had the most pronounced influence on the outdoor bacterial concentration, with the number of bacteria increasing sharply on a day of high relative humidity.

Original languageEnglish (US)
Pages (from-to)201-211
Number of pages11
JournalAerobiologia
Volume19
Issue number3-4
DOIs
StatePublished - Sep 2003

Fingerprint

relative humidity
Humidity
Bacteria
airborne microorganisms
wind speed
light intensity
bacteria
air conditioning
environmental factors
Air Conditioning
Light
samplers
Gram-positive bacteria
aerosols
Temperature
Gram-Positive Bacteria
particle size
temperature
Aerosols
Particle Size

Keywords

  • Airborne bacteria
  • Concentration
  • Indoor-outdoor
  • USA

ASJC Scopus subject areas

  • Immunology and Allergy
  • Plant Science

Cite this

Experimental study of indoor and outdoor airborne bacterial concentrations in Tempe, Arizona, USA. / Zhu, Hong; Phelan, Patrick; Duan, Tianhua; Raupp, Gregory; Fernando, Harindra J S; Che, Fengxiang.

In: Aerobiologia, Vol. 19, No. 3-4, 09.2003, p. 201-211.

Research output: Contribution to journalArticle

Zhu, Hong ; Phelan, Patrick ; Duan, Tianhua ; Raupp, Gregory ; Fernando, Harindra J S ; Che, Fengxiang. / Experimental study of indoor and outdoor airborne bacterial concentrations in Tempe, Arizona, USA. In: Aerobiologia. 2003 ; Vol. 19, No. 3-4. pp. 201-211.
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