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NOAA Oxygen Exposure Chart

PO2 Exposure
(Atmospheres)
Maximum Single Exposure
(Minutes)
Maxium 24 Hour Exposure
(Minutes)
1.6
45
150
1.5
120
180
1.4
150
180
1.3
180
210
1.2
210
240
1.1
240
270
1.0
300
300
.9
360
360
.8
450
450
.7
570
570
.6
720
720

NOAA oxygen exposure limits. Table gives limits in min for a single PO2 exposure level, and for each day (24 hr). (NOAA diving manual, 4th ed, 2000)

The NOAA Oxygen Exposure Limits chart is used primarily for avoiding CNS Oxygen Toxicity problems while diving. The first columm represents the maximum oxygen partial pressure exposure in atmospheres. The second column gives the maximum duration, in minutes, a diver may safely remain in the water at that exposure with the third column representing the maximum allowed exposure in a 24 hour period.

This table is commonly used by divers trained in the use of Enriched Air Nitrox and/or Trimix. Diver's who have not completed training in the use of these specialized gases should not attempt to execute dives using them. The NOAA Oxygen Exposure Limit chart is provided for informational purposes only.

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