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CO Levels_Risk Chart
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TM
2008 National Comfort Institute, Inc.
1-4ppm Normallevelsinhumantissuesproducedby body.
3-7ppm 6%increaseintherateofadmissionin hospitalsofnon-elderlyforasthma. (Sheppard-1999)
5-6ppm Significantriskoflowbirthrateifexposed duringlasttrimester(Ritz&Yu-1999)
5ppm 1stvisualdisplayonNSI3000LowLevel COMonitor
9ppm ASHRAEstandardforallowablespillagefrom ventedappliances,indoors,for8hours exposuredaily.EPAstandardforoutdoorsfor 8hoursandamaximum3timesperyear. (CleanAirAct)
10ppm OutdoorlevelofCOfoundassociatedwitha significantincreaseinheartdiseasedeathsand hospitaladmissionsforcongestiveheartfailure. (JAMA,Penny) lstambientleveloccupantsshouldbe notified-NCIProtocol
15-20ppmFirstlevelWorldHealthOrganizationlists ascausingimpairedperformance, decreaseinexercisetimeandvigilance 1stAlarmlevelforNSI3000LowLevel COMonitor-5minutes
25ppm MaximumallowableinaParkingGarage (InternationalMechanicalCode)
27ppm 21%increaseincardiorespiratorycomplaints (Kurt-1978)
30ppm Earliestonsetofexerciseinducedangina (WorldHealthOrganization) 1stvisualdisplayonUL2034approvedCO Alarm-Mustnotalarmbefore30days
35ppm USNIOSHrecommended8hourmaximum workplaceexposure EPAstandardforoutdoorsfor1hourand amaximumof1timeperyear
Levelmanyfiredepartmentswearbreathing apparatusbeforeentering
2ndambientleveloccupantsshouldbenotified andspaceventilated
2ndAlarmlevelforNSI3000LowLevel Monitor-5minutes
50ppm USOSHArecommended8hourmaximum workplaceexposure MaximumNCIlevelforUnventedappliances
70ppm 1stAlarmlevelofUL2034approvedCO Alarms-2-4hours 3rdAlarmlevelforNSI3000-30seconds NSI3000LowLevelMonitorcannotbesilenced byresetbutton
100ppm MaximumNCICOlevelduringruncycleinall ventedappliances(stable)
MaximumNCICOforalloilappliances
200ppm Firstlistedlevel(establishedin1930)healthy adultswillhavesymptoms-headaches,nausea NIOSH&OSHArecommendevacuationof workplace
MaximumAirFreeCOforventedwater heaterandunventedheaters(ANSIZ21)
ULapprovedalarmsmustsoundbetween 3060minutes(NSI300030seconds)
400ppm Healthyadultswillhaveheadacheswithin1-2 hours.Lifethreateningafter3hours MaximumAirFreeCOinallvented heatingappliances(ANSIZ21)
MaximumEPAlevelsforindustrialflueexhaust ULAlarmsmustalarmwithin15minutes (NSI300030seconds)
Maximumrecommendedlight-offCOforall appliancesNCI(exceptoil)
800ppm Healthyadultswillhavenausea,dizziness, convulsionswithin45minutes.Unconscious within2hoursthenDeath(establishedin1930) MaximumAirFreeCOforunventedgasovens (ANSIZ21)
800ppm+Deathinlessthanonehour
2000ppm EPAstandardfornewvehicleemissions
3000ppm+Typicalemissionsfrompropanelifttrucks, gasolinepoweredtoolsetc.
Deathinlessthan30minutes.
Carbon Monoxide Levels & RisksCO Level Action CO Level Action