| Year | Sulphur Dioxide |
Nitrogen Dioxide |
Suspended Particulate Matter |
|---|---|---|---|
| Annual Mean | Annual Mean | Annual Mean | |
|
Unit: Microgrammes per M3 |
|||
| 1983 | 21 | 32 | 202 |
| 1984 | 35 ((+)66.6) |
30 ((-)6.3) |
207 ((+)2.5) |
| 1985 | 42 ((+)100) |
34 ((+)6.3) |
257 ((+)27.2) |
| 1986 | 25 ((+)19.0) |
37 ((+)15.6) |
259 ((+)28.2) |
| 1987 | 18 ((-)14.2) |
36 ((+)11.5) |
383 ((+)89.6) |
| 1988 | 29 ((+)38.0) |
44 ((+)37.5) |
275 ((+)36.1) |
| 1989 | 27 ((+)28.5) |
42 ((+)31.3) |
256 ((+)26.7) |
| 1990 | 18 ((-)14.2) |
40 ((+)25.0) |
243 ((+)20.2) |
| 1991 | 28 ((+)33.0) |
45 ((+)41.0) |
279 ((+)38.1) |
| 1992 | 26 ((+)23.8) |
48 ((+)50.0) |
309 ((+)52.9) |
| 1993 | 26 ((+)23.8) |
49 ((+)50.0) |
224 ((+)10.9) |
| 1994 | 27 ((+)23.8) |
43 ((+)34.4) |
275 ((+)36.1) |
| 1995 | 24 ((+)14.2) |
43 ((+)34.7) |
293 ((+)45.0) |
| 1996 | 23 ((+)9.5) |
39 ((+)21.9) |
328 ((+)62.4) |
| 1997 | 24 ((+)14.2) |
36 ((+)12.5) |
272 ((+)34.7) |