BIOGEOCHEMICAL CYCLING AND POLLUTANTS EXPOSURE -- ASSESSMENT OF ECOSYSTEMS RISKS -- BIOGEOCHEMICAL STRUCTURE OF ECOSYSTEMS -- BIOGEOCHEMICAL STANDARDS -- BIOGEOCHEMICAL APPROACHES TO ECOSYSTEM ENDPOINTS -- BIOGEOCHEMICAL APPROACHES TO HUMAN EXPOSURE ASSESSMENT -- NATURAL BIOGEOCHEMICAL PECULIARITIES OF EXPOSURE ASSESSMENT -- ARCTIC AND TUNDRA CLIMATIC ZONE -- BOREAL AND SUB-BOREAL CLIMATIC ZONE -- SEMI-ARID AND ARID CLIMATIC ZONES -- SUBTROPIC AND TROPIC CLIMATIC ZONE -- EXPOSURE ASSESSMENT IN TECHNOGENIC BIOGEOCHEMICAL PROVINCES -- OIL AND GAS BIOGEOCHEMICAL PROVINCES -- METALLOGENIC BIOGEOCHEMICAL PROVINCES -- URBAN BIOGEOCHEMICAL PROVINCES -- AGROGENIC BIOGEOCHEMICAL PROVINCES -- ENVIRONMENTAL RISK ASSESSMENT IN A REGIONAL SCALE -- CALIFORNIA CASE STUDIES -- EURASIAN CASE STUDIES -- CASPIAN SEA ENVIRONMENTS -- TRANSBOUNDARY N AND S AIR POLLUTION -- TRANS-BOUNDARY HM AIR POLLUTION -- TRANS-BOUNDARY POP TRANSPORT -- TRANSBOUNDARY GAS AND OIL PIPELINES.