a 1 ota m, boat 145 400 TAM-4 WIND DIRECTION + I | L tm dior o ted | os00-- - | l I 1 [= oO . x . ae jo" ~ . fo . —* | * | i a 0 g & Pore wo a = T ham im . ™ te, t 1 i Sa eg = <i 06 - E | | ] | ! | | | | ere rrr 17 ul g 04 So | — | | - : | naan 20 JANUARY, i966 o * x< 08 = _L = Io 7 ‘east | 5so a" ] ™ “los | ° te 7 eb | | 60 = yp { i20 ee ! 6 fp [8 rr i 0.4 4 ee T TAM-4 S05 CONCENTRATION a = S oso s > che wef i . bao’ L 0.8 e L + Io T aewe % 300 _t T | | |" | .! te | | i ¥ TT ! [ ~ #60 MIDWAY TEMPERATURE T 0 / 1 i 20 | T | ° F | | i wees | 4 fo nd O uw |I } TAM-4 WIND SPEED { . om seafeee ete vende dt ® oo Qo | 0 2 4 6 8 © 2 4 19 JANUARY 1966 6 i 20 22 24 Fic. 108——Winds and SO: at TAM-1 and 2, 19 January 1966. TTT 2i 360 Fig, 106—TAM-~4 winds and SO. and Midway temperature, 16-20 January 1966. 4 300 3 240 = 2 - [80 oO da xc 5 120 2 360 = ® 300 ° = ™ = = 8ut 240 wr 5 180 «Qa 120 = 60 _ ~~ =z 2 3 w °o wi z = g |0 = = 06 0.4 ° o2 N ° ” 0.0 o 2 4 6 8 1 08 4 6 Bb 20 2 Oo [966 Fic. 109-—-Winds and SO. at TAM-6 and 8, 19 January o6 1966 . . : . . with as much information as possible about the meteorological processes involved in pollution episodes. oO ” 60 I 19 JANUARY i O4 2 02 . oO 8 4 8 ° laNuarYsobe. 1 18 20 22 Fie. 107—-Winds and SO. at TAM-3, 4, and 5, 19 January 1966. z° e & Qa a * : 0.8 0 a e ea 10 3 z a - i te RMee te and alelsaleCehabeA.beeha” aterearniloh, Aaa re Mudd eee * Chicago weather phenomena and SO. pollution sources interact in a number of different ways to produce episodes of severe pollution. The case studies presented in this paper are a first step in our study of these events.