(concentrations : ng.m-3)	Cd	Cu	Pb	Zn	 	 	 	  	 	 	 	 	 	 	 

28/01/87	0.46	6.85	79.7	41.00	 	 	 	 	 	 	 	 	  	 	 
30/01/87	0.43	4.75	21.1	60.2	 	 	 	 	 	 	 	 	 	 	 
25/02/87	0.16	3.00	5.2	18.6	 	 	 	 	 	 	 	 	 	 	 
19/03/87	0.39	3.6	17.5	19.3	 	 	 	 	 	 	 	 	 	 	 
16/04/87	0.43	15.4	47.9	70.6	 	 	 	 	 	 	 	 	 	 	 
03/06/87	0.2	2.9	40.6	13.9	 	 	 	 	 	 	 	 	 	 	 
01/07/87	0.69	7.2	42.1	66.8	 	 	 	 	 	 	 	 	 	 	 
15/09/87	0.03	3.5	13,00	10.5	 	 	 	 	 	 	  	 	 	 	 
19/10/87	0.08	3.2	22.1	7.6	 	 	 	 	 	 	 	 	 	 	 
02/11/87	1.61	24.00	106.85	95.5	 	 	 	 	 	 	 	 	 	  	 
15/11/87	1.48	8.6	33.2	123.7	 	 	  	 	 	 	 	 	 	 	 
10/12/87	0.08	2.2	9.4	9.6