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Table 5 Assessments of bacterial indoor air quality in the selected eight public Primary schools in Gondar city, according to the sanitary standards for non-industrial premises (n = 51)

From: Indoor bacterial load and its correlation to physical indoor air quality parameters in public primary schools

  Bacterial
Sampling time   6:30–7:30 am 5:00–6:00 pm
Range of values (CFU/m3)   < 50 50–100 100–500 500–2000 > 2000 < 50 50–100 100–500 500–2000 > 2000
Degree of Air Pollution Very low Low Intermediate High Very high Very low Low Intermediate High Very high
School School 1
  School 2
  School 3
  School 4
  School 5
  School 6
  School 7
  School 8
  1. NB: ≤ 500 CFU/m3 is the permissive standard, () in the range; () not in the range