The Scottish Environment Statistics - 1998

4. ATMOSPHERE

Table 4.9 Trace element trends in annual average urban concentrations of lead, iron zinc in air, 1984/85-1995/961 Nanogram/m3(2) 1984/85 1985/86 1986/87 1987/88 1988/89 1989/90 1990/91 1991/92 1992/93 1993/94 1994/95 1995/96 Lead Glasgow 210 210 140 160 110 130 111 95 82 82 44 50 Motherwell 160 250 180 120 - 249 181 114 52 223 22 58 Iron Glasgow 540 530 420 510 480 426 539 483 375 358 327 343 Motherwell 1,410 2,060 1,600 1,500 2,400 1,789 1,780 1,520 964 2423 355 544 Zinc Glasgow 120 110 130 160 140 96 95 79 65 76 43 55 Motherwell 120 240 220 220 400 221 212 122 69 213 19 62 Source: AEA Technology, NETCEN 1 Pollution year period (e.g. Apr 1980 - March 1981). 2 A nanogram is a thousand millionth (10-9) of a gram. The following conversion formula may be used to convert from nanograms/kg of air to nanograms/m3 of air - the more common measurement of pollutant concentrations in the atmosphere. 1m3 air at 15oC, 760mm Mercury (Standard Cubic Metre)=1.226kg. 3 only 3 months data available at Motherwell in 1993/94.