Figure 4.51 Health protection air levels according to AEGL-2 Health protection air Average period for monitoring level for carbon against the health protection monoxide (ppm) level for carbon monoxide AEGL–2 levels for Averaged over: carbon monoxide: 10 minutes 420 ppm 30 minutes 150 ppm 1 hour 83 ppm 4 hours 33 ppm 8 hours 27 ppm The Department of Health used the levels indicated in Figure 4.51 above to develop the Carbon Monoxide Response Protocol. The Department of Health then applied a further level of conservatism by lowering the standard for one hour exposure from 83 ppm to 70 ppm.79 The Carbon Monoxide Response Protocol provides that if the one hour average value of 70 ppm carbon monoxide is reached, or if the four hour average value of 33 ppm carbon monoxide may be reached, or if the eight hour average of 27 ppm carbon monoxide may be reached, then:
Figure 4.51 Health protection air levels according to AEGL-2 Health protection air level for carbon monoxide (ppm) Average period for monitoring against the health protection level for carbon monoxide AEGL–2 levels for carbon monoxide: 420 ppm 150 ppm 83 ppm 33 ppm 27 ppm Averaged over: 10 minutes 30 minutes 1 hour 4 hours 8 hours The Department of Health used the levels indicated in Figure 4.51 above to develop the Carbon Monoxide Response Protocol. The Department of Health then applied a further level of conservatism by lowering the standard for one hour exposure from 83 ppm to 70 ppm.79 The Carbon Monoxide Response Protocol provides that if the one hour average value of 70 ppm carbon monoxide is reached, or if the four hour average value of 33 ppm carbon monoxide may be reached, or if the eight hour average of 27 ppm carbon monoxide may be reached, then:
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