Fig. 4From: Long-range transport of mutagens and other air pollutants from mainland East Asia to western JapanRatio of concentration of [FR]/([FR] + [PY])) measured at Yurihama. The intervals for collecting TSP were as follows: summer (June–August), autumn (September–November), winter (December–February), and spring (March–May). Statistical analysis was performed on the ratios of [FR]/([FR] + [PY]) by Dunnett’s testBack to article page