147 CALM 1-2kt ——O 3-7 kt2—O 8-12 ktt+—O 13-17 kt L—-O 10 14 sO ! ARG ARG ta Leairitiisid | 10 km 10 km © LB NBU NBU TAM-| 0 0.05 Oo | woian | 1gc¢ 19 JAN 1966 | woman | I7c 19 JAN i966 | we 6 0.2 ppm Wy iG 23 ——() TAM-2 2 TAM”7 ——~o7{/0.34 TAM: 35 {2 / 1st MDW 10.16 0.2 Qehrd Tam-3\ TAM-4 SN 3 07 ARG i9c 19 JAN 1966 Lehn 10 km ~ ; | Oran | et 0-19-92 ~A-6 oo Ta) ARG | INDIANA 2ic | 19 JAN 1966 Letts 10 km | | Fic, 111.—Weather and pollution maps for Chicago area, 19 January 1966 i |