The Scottish Environment Statistics - 1998

4. ATMOSPHERE

Table 4.12 Sulphur dioxide measurements, 1991-19961 1991 1992 1993 1994 1995 1996 Strath Vaich Annual mean (ppb)2 0.7 0.3 0.4 0.4 0.2 0.3 98% percentile of hourly values (ppb) 8.3 2.3 3.1 3.3 1.7 2.5 Running 24 hour mean >= 44ppb3 0 0 0 0 0 0 Number of annual means >= 17ppb3 0 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 Number of 15-minute means >= 100ppb 0 0 0 0 0 0 Data capture, % 56 70 77 62 94 93 Edinburgh Centre Annual mean (ppb)2 .. .. 8 8 8 4 98% percentile of hourly values (ppb) .. .. 38 37 35 18 Running 24 hour mean >= 44ppb3 .. 0 27 31 0 0 Number of annual means >= 17ppb3 .. .. 0 0 0 0 Number of high periods4 .. 0 2 1 0 0 Number of very high periods4 .. 0 0 0 0 0 Number of 15-minute means >= 100ppb .. 3 50 30 19 7 Data capture, % .. 24 96 96 97 91 Glasgow Centre Annual mean (ppb)2 .. .. .. .. .. .. 98% percentile of hourly values (ppb) .. .. .. .. .. .. Running 24 hour mean >= 44ppb3 .. .. .. .. .. 0 Number of annual means >= 17ppb3 .. .. .. .. .. .. Number of high periods4 .. .. .. .. .. 0 Number of very high periods4 .. .. .. .. .. 0 Number of 15-minute means >= 100ppb .. .. .. .. .. 0 Data capture, % .. .. .. .. .. 42 Source: AEA Technology NETCEN 1 Figures are for calendar year. 2 Parts per billion 3 WHO guidelines. 4 UK air quality bands: high band 15 minute average 200-399 ppb, very high band minute average 400 or more ppb.