Use of a-, b- and g-hexachlorocyclohexane in Europe, 1970-1996

Data on current and historical usage of a-, b- and g-hexachlorocyclohexane (HCH) in Europe are presented. The
data were collected and estimated as a part of a project studying the regional cycling of persistent organic pollutants (POPs) in the Baltic environment (Popcycling-Baltic). Better data on sources, environmental discharges and atmospheric emissions of HCH and other POPs are needed to study, and hopefully reduce, the impact of these
pollutants on the environment. Substantial uncertainties are assigned to the estimated data for individual countries
and years, but it seems likely that the general trend of usage in Europe is captured. The quality of the estimates is
thought to improve in general throughout the period, thus, reflecting the availability of reliable data. The results
suggest that 382 000 t of technical HCH and 81 000 t of lindane were used in Europe from 1970 to 1996. This is
equivalent to an estimated cumulative usage of 259 000 t a-HCH, 135 000 t g-HCH and 20 000 t b-HCH. The usage
of technical HCH was the major source of g-HCH until the late 1970s, and thereafter lindane became the
dominating source of this isomer. The use of g-HCH in 1996 was estimated to still be nearly one-third of the
European usage in 1970. The pattern of decreasing concentrations in biota follows the pattern of reductions in usage for the studied period within the Baltic area.