Benzene, an aromatic volatile organic compound, is emitted into the atmosphere from anthropogenic sources such as vehicle exhaust. In terms of a carcinogenic risk to humans, benzene has been monitored by municipal research institute for atmospheric environment. However, monitoring data for benzene concentration in each prefecture is limited due to the monitoring cost and resource. In this study, we estimated the ambient benzene concentration at 30 monitoring stations in Gunma using the reduced

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... ajor axis regression analysis. The regression equation was obtained by the observation data of NOx and benzene measured at five monitoring stations in fiscal years 2009-2013 (except for 2010). Our results showed that benzene concentrations were below the environmental quality standard level (3 μg/m 3 ) at all the monitoring stations in Gunma. However, relatively high level of benzene was estimated at roadside monitoring stations of Tatebayashi, Jyonan (Takasaki), and Shibukawa.