Monitor. location (see table1) | Zone3-150 | Area | Type of monitoring | ||||||
---|---|---|---|---|---|---|---|---|---|
National survey3-151annual mean | Study survey 4 sample mean 1993 | Continuous monitoring | |||||||
Monthly mean of hourly means 1993–4 | Min–max highest hourly means 1993–4 | Annual mean | |||||||
1986 | 1991 | 1993 | 1994 | ||||||
N/A | St Hilda's | 22 | 24 | ||||||
N/A | Billingham | 26 | |||||||
N/A | Stockton Centre | 17 | 26 | ||||||
17 | C | Ragworth Centre | 17 | 20 | |||||
1 | A | Dormanstown | 21 | ||||||
2 | A | Grangetown | 18 | 7–19 | 32–75 | 12 | 12 | ||
4 | A | South Bank | 19 | ||||||
6,8,103-152 | B | East Middlesbrough | 18 | 7–21 | 29–71 | 11 | 13 | ||
18 | C | Blue Hall | 20 | ||||||
19 | C | Hardwick | 18 |
↵3-150 Zone: A=near; B=intermediate; C=far.
↵3-151 National diffusion tube survey at six locations,26diffusion survey carried out specifically for this study at 22 sites, covering 2-weekly sampling on four occasions.
↵3-152 East Middlesbrough mean of locations in Brambles Farm, Netherfields, and Berwick Hill.