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FY 2005 Monitoring Results of Hazardous Air Pollutants

October 13, 2006

In compliance with the Air Pollution Control Law, local governments have been monitoring the level of hazardous air pollutants in the atmosphere. The results of these monitoring surveys for FY 2005 have been compiled together with the results of those conducted by the Ministry of the Environment (MOE) during the same time period. The results are as follows:

1. Substances for which environmental quality standards (EQSs)* are established (four substances)

Measurements of benzene exceeded the EQS at 3.9% of all monitoring points, which was improved from 5.5% in FY 2004. The average concentration level also showed a declining trend. Measurements of the other substances were below the EQSs at all monitoring points (Table 1).

2. Substances for which guideline values are established as a guide to reduce health risks resulting from hazardous air pollutants in the air (four substances)

Measurements of nickel compounds exceeded the guideline value at 0.9% (1.8% in FY 2004) of all monitoring points, and the average concentration level showed a declining trend. Measurements of the other substances were below the guideline values at all monitoring points (Table 2).

* For information on EQSs, please see the MOE's website (http://www.env.go.jp/en/air/aq/aq.html).

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