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Toxic

Technical Article: Effects of Toxic Gas Exposure

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Effects of Toxic Gas Exposure

 Oxygen content* (% by Vol.)  

 Effects  

 19.5%  

 minimum permissible level  

 15-19%  

 coordination impaired  

 12-14%

 judgement / perception impaired

10-12%  

further impairment, lips blue  

 8-10%  

 fainting, unconsciousness  

 6-8%  

 fatal in 8 minutes  

 4-6%  

 coma in 40 seconds  


 

 

H2S Hydrogen Sulphide PPM Level*

Effects

Time

10

Max permissible exposure level

8 hours

50-100

mild eye/respiratory irritation

1 hour

200-300

marked eye/respiratory irritation

1 hour

500-700

unconsciousness, death

.5 to 1 hour

1000+

unconsciousness, death

within minutes


 

 

CO Carbon Monoxide PPM Level*

 Effects  Time

 35  

 Max permissible level  

 8 hours  

 200  

 slight headache  

 3 hours  

 400-600  

 headache, discomfort  

 1-2 hours  

 1000-2000   

 staggering, heart palpitation

 1.5 hour

2000-5000

 unconsciousness, death 

.5 -1 hour 


 

 

Cl2 Chlorine PPM Levels

 Effects  Time

1

 max permissible  level

 8 hours  

3-6

 stinging eyes, nose,  throat

 minutes  

15-30

 serious irritation  

 minutes  

40-60

 respiratory damage  

 30 minutes  

60-1000

 serious injury, death  

 minutes  


 

 

Sulphur Dioxide SO2 PPM Level*

 Effects  Time

2

 max permissible  exposure level 

 8 hours  

10  

 stinging eyes, nose,  throat

 minutes  

150  

 serious irritation  

 minutes  

500  

 respiratory damage  

 30 minutes  

1000-2000  

 serious injury, fatal  

 minutes  


 

 

Nitrogen Dioxide NO2 PPM Level*

 Effects  Time

 3  

 slightly irritating  

 8 hours  

 10-20  

 irritation/coughing  

 minutes  

25

 pulmonary symptoms  

 8 hours   

100 plus 

immediate distress

minutes

 200-700  

 severe pulmonary injury  

 minutes  

 


* All values are approximate and given as general information only

** CO has an affinity for human blood haemoglobin that is over 200 times greater than Oxygen

*** Serious effects of NO2 exposure may be delayed until several hours after inhalation


Effect-of-Toxic-Exposure.pdf


 

 

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