Table 2

Mean concentrations of smoke^2-150and SO₂ in Teesside 1968 in summer and winter in μg/m³ (data source^{8 19})

Site code		Zone, if applicable^2-151		Smoke season			SO₂season
Site code		Zone, if applicable^2-151		Winter	Summer		Winter	Summer
a	A	284	84		211	72
b		98	37		151	58
c		140	33		109	49
d	B	56	57		94	57
e		56	32		64	45

↵2-150 Smoke was used as a measurement of fine suspended particulate matter <15 μm examining blackness of filters.
↵2-151 Zones: A=near to industry; B=intermediate distance from industry.