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<br />Table 2. Pollution Episode Criteria <br />Pollutant <br />Alert Level <br />Warning Level <br />Emergency Level <br />Gaseous 1-hr. Avg. 24-hr. Avg. <br />parts p er million) <br />Sulfur Dioxide 0.30 0.17 <br />Carbon Monoxide 40 15* <br />Nitric Oxide 0.4 0.2 <br />Nitrog en Dioxide 0.30 0.20 <br />Total Hydrocarbons 15 10 <br />Total Oxidants 0.20 0.12 <br />Suspended Particulate <br /> <br />COH 3.0 <br />1-hr. Avg. 24-hr. Avg. <br />1-hr. Avg. 24-hr. Avg, <br />0.50 0.28 0.70 0.39 <br />60 30* 70 40* <br />0.6 0.3 0.8 0.4 <br />0.40 0.25 0.60 0.37 <br />18 12 20 13 <br />0.30 0.18 0.40 0.25 <br />5.0 7.0 <br /> <br />*For 8-hour average <br />