The Scottish Environment Statistics - 1998

4. ATMOSPHERE

Table 4.13 Carbon monoxide measurements, 1991-19961 1991 1992 1993 1994 1995 1996 Glasgow City Chambers Annual mean (ppm)2 1.4 1.2 0.9 0.8 0.7 0.7 98% percentile of hourly values (ppm) 5 4.5 3.6 2.9 2.5 2 Running 8 hour means >= 10ppm3 14 0 0 0 0 0 Number of high periods4 0 0 0 0 0 0 Number of very high periods4 0 0 0 0 0 0 Data capture, % 97 92 89 99 97 84 Edinburgh Centre Annual mean (ppm)2 .. .. 0.6 0.6 0.6 0.5 98% percentile of hourly values (ppm) .. .. 1.9 1.7 1.7 1.4 Running 8 hour means >= 10ppm3 .. 0 0 0 0 0 Number of high periods4 0 0 0 0 0 0 Number of very high periods4 0 0 0 0 0 0 Data capture, % .. 22 95 95 95 89 Glasgow Centre Annual mean (ppm)2 .. .. .. .. .. .. 98% percentile of hourly values (ppm) .. .. .. .. .. .. Running 8 hour means >= 10ppm3 .. .. .. .. .. 0 Number of high periods4 0 0 0 0 0 0 Number of very high periods4 0 0 0 0 0 0 Data capture, % .. .. .. .. .. 38 Source: AEA Technology NETCEN 1 Figures are for calendar year. 2 Parts per million 3 WHO guideline, and UK National Strategy Calculated for each hour "h" by averaging concentrations between hours "h" and "h-7". 4 DETR air quality bands: high band 8hr running average 15-19ppm, very high band: 8hr running average 20 or more ppm.