1. CO: carbon monoxide measurements (in parts per million)
2. source : source of the measurement (refinery)
3. date: date that the measurement was taken

CO	source		date
45	refinery	4/16/93
30	refinery	4/17/93
38	refinery	4/18/93
42	refinery	4/19/93
63	refinery	4/20/93
43	refinery	4/21/93
102	refinery	4/22/93
86	refinery	4/23/93
99	refinery	4/24/93
63	refinery	4/25/93
58	refinery	4/26/93
34	refinery	4/27/93
37	refinery	4/28/93
55	refinery	4/29/93
58	refinery	4/30/93
153	refinery	5/1/93
75	refinery	5/2/93
58	refinery	5/3/93
36	refinery	5/4/93
59	refinery	5/5/93
43	refinery	5/6/93
102	refinery	5/7/93
52	refinery	5/8/93
30	refinery	5/9/93
21	refinery	5/10/93
40	refinery	5/11/93
141	refinery	5/12/93
85	refinery	5/13/93
161	refinery	5/14/93
86	refinery	5/15/93
71	refinery	5/16/93

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