The Scottish Environment Statistics - 1998

4. ATMOSPHERE

Table 4.14Thoracic particles, PM10 measurements, 1991-19961 1991 1992 1993 1994 1995 1996 Edinburgh Centre Annual mean (mg m-3) 2 .. .. 23 20 20 19 98% percentile of hourly values (mg m-3) .. .. 57 50 59 52 Number of running 24 hour means >= 50mg m-3 3 .. 73 43 31 196 140 Number of high periods4 Number of very high periods4 Data capture, % .. 17 82 89 92 97 Glasgow Centre Annual mean (mg m-3)2 .. .. .. .. .. .. 98% percentile of hourly values (mg m-3) .. .. .. .. .. .. Number of running 24 hour means >= 50mg m-3 3 .. .. .. .. .. 76 Number of high periods4 Number of very high periods4 Data capture, % .. .. .. .. .. 42 Source: AEA Technology NETCEN 1 Figures are for calendar year. 2 mg=10-6gram 3 UK National Strategy 4 DETR air quality bands: high band 24 hour running average 75-99mg m-3, very high band 24 hour running average 100 or more mg m-3.