CONTENTS -- ENVIRONMENTAL HEALTH CRITERIA FOR THALLIUM -- PREAMBLE 9 -- 1. 45 -- 3.2 Anthropogenic sources 45 -- 3.2.1 Production levels and processes 45 -- 3 -- EHC 182: Thallium Environmental levels ^ 60 -- 5.1.1 Air 60 -- 5.1.2 Water 61 -- 5.1.2.1 Areas not contaminated by thallium 61 -- 5.1.2.2 Areas contaminated by thallium from -- industrial sources 61 -- 5.1.3 Rocks, soil and sediment 64 -- 5.1.3.1 Areas not contaminated by thallium 64 -- 5.1.3.2 Areas contaminated by thallium