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Table 4 Detection rates of mutagenic activity by the microsuspension method

From: Evaluation of the genotoxicity of PM2.5 collected by a high-volume air sampler with impactor

  Tsukuba Maebashi Nagoya Fukuoka
number parcentage(%) number parcentage(%) number parcentage(%) number parcentage(%)
Negative 3 (4.7) 1 (1.6) 2 (3.1) 3 (4.7)
week positive 13 (20.3) 18 (28.1) 13 (20.3) 11 (17.2)
Positive 48 (75.0) 45 (70.3) 49 (76.6) 50 (78.1)
sum 64 (100.0) 64 (100.0) 64 (100.0) 64 (100.0)