Concentration and Size Distribution of Culturable Airborne Microorganisms in Outdoor Environments in Beijing, China

Figures & data

TABLE 1 Characteristics of FA-I sampler

Series	Aperture/mm	Velocity of air flow/ ms''^1	Range of trapping/ urn	ECD*/urn
Stagel	1.18	1.08	> 8.2	8.2
Stage2	0.91	1.79	5.0–10.4	6.0
Stages	0.71	2.97	3.0–6.0	3.0
Stage4	0.53	5.28	2.0–3.5	2.0
Stages	0.34	12.77	1.0–2.0	1.0
Stage6	0.25	23.29	< 1.0	0.65

TABLE 2 Microbial concentration background in the Beijing atmosphere (CFU/m³); containing three sampling sites; June 2003–May 2004

Microbial group	Minimum	Maximum	Arithmetic mean	Geometric mean	Median
Total	4.8 × 10^2	2.4 × 10^4	3.7 × 10^3 ± 2.1 × 10^2	2.8 × 10^3	2.7 × 10^3
Bacteria	7.1 × 10	2.2 × 10^4	2.2 × 10^3 ± 1.2 × 10^2	1.4 × 10^3	1.4 × 10^3
Fungi	2.4 × 10	1.4 × 10^4	1.2 × 10^3 ± 7.3 × 10	7.7 × 10^2	7.1 × 10^2
Actinomycetes	0	9.8 × 10^2	1.4 × 10^2 ± 8.0	—	1.1 × 10^2

FIG. 1 Concentration percentage of airborne bacteria, fungi and actinomycetes at different sampling sites in Beijing, China; June 2003–May 2004.

FIG. 2 Seasonal variation pattern of total microbial concentration at three sampling sites in Beijing, China; June 2003–May 2004.

FIG. 3 Temporal variation pattern of total microbial concentration at three sampling sites in Beijing, China; June 2003–May 2004.

FIG. 4 Concentration and size distribution of airborne bacteria at different sampling sites at three sampling sites in Beijing, China; June 2003–May 2004.

FIG. 5 Concentration and size distribution of airborne fungi at three sampling sites in Beijing, China; June 2003–May 2004.

FIG. 6 Concentration and size distribution of dominant fungi at three sampling sites in Beijing, China; June 2003–May 2004.

FIG. 7 Concentration and size distribution of airborne actinomycete at three sampling sites in Beijing, China; June 2003–May 2004.