Summary of Smoke Data 1997-98						Summary of SO2 Data 1997-98
				Grid ref to 100m		Valid Days	Max. Gap	Arith. Mean	Median	98th %ile	Max. Day	Valid Days	Max. Gap	Arith. Mean	Median	98th %ile	Max. Day
Code	Site Name	Region	Authority	East	North
EAST MIDLANDS
40004	ALFRETON 4	East Mids	Amber Valley	4417	3555	358	6	15	10	68	102	358	6	28	27	67	116
348001	BIRCOTES 1	East Mids	Bassetlaw	4627	3920	361	1	9	7	36	55	361	1	20	19	60	107
1754501	LANGOLD (BASSETLAW) 1	East Mids	Bassetlaw	4586	3873	279	50	8	5	30	50	280	50	19	18	59	86
2677503	RETFORD 3	East Mids	Bassetlaw	4707	3811	333	13	9	6	39	53	333	13	28	26	58	96
395005	BOLSOVER 5	East Mids	Bolsover	4475	3706	101	9	7	6	20	34	101	9	23	20	59	66
2967002	SOUTH NORMANTON 2	East Mids	Bolsover	4442	3564	364	0	10	8	41	62	357	7	17	12	55	105
675018	CHESTERFIELD 18	East Mids	Chesterfield	4372	3709	273	0	7	6	13	15	273	0	49	50	69	76
960024	DERBY 24	East Mids	Derby City	4354	3369	333	15	11	8	46	65	333	15	19	20	47	54
1790019	LEICESTER 19	East Mids	Leicester City	4588	3041	325	22	9	6	32	65	328	22	23	20	60	70
1840005	LINCOLN 5	East Mids	Lincoln	4974	3714	352	7	7	4	31	53	352	7	19	19	40	177
2281010	MANSFIELD 10	East Mids	Mansfield	4532	3607	357	7	12	9	44	73	357	7	35	31	79	130
2281102	MANSFIELD WOODH'SE. 2	East Mids	Mansfield	4538	3642	348	8	13	10	51	64	349	8	43	41	93	134
2364502	NEW OLLERTON 2	East Mids	Newark	4664	3682	355	7	11	8	42	62	354	7	26	24	73	111
2440020	NOTTINGHAM 20	East Mids	Nottingham	4575	3403	321	8	12	9	49	67	318	8	21	22	42	57
750005	COALVILLE 5	East Mids	NW Leicestershire	4428	3142	307	43	9	8	33	63	307	43	24	25	49	64
WEST MIDLANDS
530018	CANNOCK 18	West Mids	Cannock Chase	3989	3117	326	2	8	5	34	46	326	2	12	12	25	45
2775021	RUGELEY 21	West Mids	Cannock Chase	4043	3173	241	88	8	6	30	49	241	88	30	26	80	143
2870005	SEDGLEY 5	West Mids	Dudley	3919	2934	362	2	14	14	32	61	362	2	20	19	44	51
507513	BURTON-UPON-TRENT 13	West Mids	East Staffordshire	4242	3233	294	20	10	8	40	67	302	20	20	18	50	71
2460005	OLDBURY 5	West Mids	Sandwell	3990	2896	362	1	7	3	42	97	362	1	16	13	40	49
3090020	STOKE-ON-TRENT 20	West Mids	Stoke-On-Trent	3888	3475	304	15	13	11	48	75	311	15	31	25	70	89
3380018	WALSALL 18	West Mids	Walsall	4014	2987	363	1	10	7	44	110	362	1	14	9	53	83
3470002	WEDNESFIELD 2	West Mids	Wolverhampton	3946	3002	339	13	9	6	41	55	339	13	18	18	37	49

The following abbreviations are used in the table:
1. "Valid Days" denotes the number of valid days' data obtained for the year.        
2. " Max. Gap" is the maximum number of consecutive days for which no valid value was obtained.         
(Excludes periods when site was not in operation eg. those starting or ceasing part way through year.)        
3. "Arith. Mean" is the arithmetic mean of all daily values, calculated by the usual method, as described in Appendix 1.        
4. "Median" is the median of all daily values. Calculated by the usual method, see Appendix 1.        
5. "98th %ile" is the 98th percentile for all daily values, see Appendix 1.        
6. "Max. Day" is the maximum daily value measured during the year.        

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