Notes: * Congeners which were not detected have been included as if they were present at the detection limit
** Q2-Q1 inclusive (e.g. 1996-7 included Q2-Q4 1996 and Q1 1997)
** Q2-Q1 inclusive (e.g. 1996-7 included Q2-Q4 1996 and Q1 1997)
| Change since | |
 |
1970 |
 |
1990 |
|
Strategy [1] |
Coverage: England and Wales
Source: NETCEN
Note: Data not available between 1996 and 1999
Coverage: England and Wales
Source: NETCEN
Coverage: United Kingdom
Source: Food Standards Agency, Defra
- Annual concentrations of dioxins in air have decreased substantially since the early 1990s, while showing relatively little change since the late 1990s.
- From 1995 to 2002, annual average concentrations of PCBs in air fell by between 40 and 90 per cent at the four available monitoring sites.
- In 2001, estimated dietary intakes of dioxins and PCBs were under one tenth and under one twentieth of their respective 1982 levels.