Abstract
In the vast central waters of the East China Sea, the Huanghai Sea, the Bohai Sea and the estuaries of the Changjiang River and the Huanghe River, pollution is insignificant, locally, and in baseline level only. Pollution conditions are summarized as follows Rivers are the chief sources of marine pollutants, followed by the direct discharge of factories, ships, sea ports, and offshore platforms; Oil is the main pollutant in the sea, and is more serious in some coastal regions of the Bohai, the Huanghai, and the East China seas; Organic pollution (coinciding with high COD) and nutrients are more evident than oil pollution in some coastal regions; Heavy-metal pollution is not serious, except in some small parts of the inshore and estuarine waters; Air pollution is heavy over the cities, especially over the steel works.
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