1 74 0.8 *— ee 0.9 TAM - | 0.7 }— 0.6 }— TAM -2 MAX 0.5 -— 1 SO,, ppm MAX 0.4 90 0.1 S02, ppm 0.8 50. { 4 [ 8 | \2 HOUR, CST 16 | 20 | 24 0 | 4 | 8 12 “HOUR, CST | i6 Fig, 186.—Selected percentile curves relating SO, concentration with time at TAMStations 1-4 20 24