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Lead in the Royal Borough
Monitoring
Lead is monitored using sampling equipment which collects particles on a
filter. These filters are collected weekly/monthly and then analysed using
atomic absorption spectrophotometry. Lead is currently monitored by DEFRA at
their monitoring site on the Cromwell Road. The Ladbroke Grove monitoring site
ceased operation at the end of 2001.
Long term trends
The results of monitoring in the borough since 1983 show:
- there has been a significant downward decline of levels;
- the levels at Cromwell Road and Ladbroke Grove are already below objective
levels for both 2005 and 2010;
- whilst in the 1990's monitoring showed levels were higher at the Cromwell
Road compared to Ladbroke Grove by 2001 concentrations had reached
comparable levels at both sites.
Annual mean lead levels - micrograms/cubic metre (mg/m3)
| 1990 |
|
0.38 |
0.50 |
0.25 |
| 1991 |
0.29 |
0.36 |
0.50 |
0.25 |
| 1992 |
0.23 |
0.34 |
0.50 |
0.25 |
| 1993 |
0.17 |
0.26 |
0.50 |
0.25 |
| 1994 |
0.13 |
0.24 |
0.50 |
0.25 |
| 1995 |
0.08 |
0.20 |
0.50 |
0.25 |
| 1996 |
0.07 |
0.15 |
0.50 |
0.25 |
| 1997 |
0.08 |
|
0.50 |
0.25 |
| 1998 |
|
0.09 |
0.50 |
0.25 |
| 1999 |
0.07 |
0.07 |
0.50 |
0.25 |
| 2000 |
0.04 |
0.03 |
0.50 |
0.25 |
| 2001 |
0.03 |
0.03 |
0.50 |
0.25 |
| 2002 |
|
0.03 |
0.50 |
0.25 |
| 2003 |
|
0.02 |
0.50 |
0.25 |
| 2004 |
|
0.02 |
0.50 |
0.25 |
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