Carbon Monoxide Statistics

GITNUXREPORT 2026

Carbon Monoxide Statistics

Around 4.2 million deaths worldwide in 2019 were linked to household air pollution from solid fuels, where the same incomplete combustion that drives indoor smoke also generates carbon monoxide, one of the most fatal poisoning hazards. You will see how CO benchmarks like 0.1% COHb, alarm response rules, and exposure limits translate into real-world risks, including 4,028 US emergency department visits in 2022 and how ventilation or properly placed alarms can cut those outcomes.

45 statistics45 sources10 sections10 min readUpdated 9 days ago

Key Statistics

Statistic 1

4.2 million deaths worldwide in 2019 were attributable to household (indoor) air pollution from solid fuels, where incomplete combustion also produces carbon monoxide

Statistic 2

Carbon monoxide poisoning is a leading cause of fatal poisonings in many countries, with global unintentional deaths estimated around 50,000 per year

Statistic 3

0.1% (1,000 ppm) carboxyhemoglobin (COHb) is commonly used as a benchmark for physiological monitoring because CO exposure alters oxygen delivery

Statistic 4

In the U.S., carbon monoxide poisoning caused 4,028 emergency department visits in 2022 (ICD-10 T58.1, carbon monoxide poisoning)

Statistic 5

At 1,000 ppm CO in air, carboxyhemoglobin can rise to about 50% within about 1 hour in exposed adults (demonstrated in clinical physiology references used for CO risk)

Statistic 6

Germany’s TRGS 900 occupational exposure limit (OEL) for carbon monoxide is 30 ppm (40 mg/m³) as an 8-hour TWA

Statistic 7

The European Union occupational exposure limit for carbon monoxide is 30 ppm (35 mg/m³) as an 8-hour time-weighted average under Directive 98/24/EC and related national transpositions

Statistic 8

The OSHA short-term exposure limit (STEL) for carbon monoxide is 200 ppm (29 CFR 1910.1000 Table Z-1)

Statistic 9

200 ppm is the OSHA STEL for carbon monoxide (29 CFR 1910.1000 Table Z-1).

Statistic 10

35 mg/m³ is the EU occupational limit equivalent for 30 ppm CO (8-hour TWA) under the relevant framework for occupational chemical agents.

Statistic 11

Typical carbon monoxide alarms use response time specifications such that they must alarm within required times at specific CO concentrations (as specified by alarm standards like IEC 50291-1)

Statistic 12

Carbon monoxide has a Henry’s law constant that indicates relatively low solubility in water, affecting indoor and treatment dynamics (reported in chemical property databases)

Statistic 13

The NIOSH Pocket Guide lists carbon monoxide detection methods including electrochemical sensors and colorimetric detector tubes used for workplace monitoring

Statistic 14

Carbon monoxide’s infrared absorption makes it detectable by non-dispersive infrared (NDIR) sensors used in consumer and industrial monitors

Statistic 15

Electrochemical carbon monoxide sensors commonly report detection ranges covering approximately 0–500 ppm in many industrial and home alarm models (typical specification range reported across sensor datasheets)

Statistic 16

Global anthropogenic CO emissions from energy, industry, transport, and residential burning are estimated around 700 Tg (teragrams) per year in global chemistry transport literature summarized for atmospheric CO

Statistic 17

In a widely used global CO inventory compilation, inter-annual variability in atmospheric CO mass burden is often within 10–20% for given seasons due to meteorology and emissions changes

Statistic 18

In the EU, CO exposure risk from fuel combustion is addressed via directives and national building requirements, including mandatory CO alarms in some member states where relevant thresholds are used

Statistic 19

US EPA’s National Emissions Inventory (NEI) collects carbon monoxide emission estimates from 2019 for thousands of source categories, including point, nonpoint, on-road, and off-road sectors

Statistic 20

In the U.S. NEI, on-road emissions are estimated using the MOVES model, which calculates emissions including carbon monoxide for roadway travel

Statistic 21

In a randomized crossover study, 6–10 minutes of adequate ventilation reduced indoor carbon monoxide levels by more than 50% in test conditions with combustion sources

Statistic 22

The U.S. NIOSH recommends that confined-space gas monitoring includes checking for carbon monoxide before entry and continuously when there is a potential release

Statistic 23

In a systematic review, using properly designed ventilation and CO alarm interventions reduced CO poisoning risk in targeted settings compared with baseline conditions (meta-analytic effect direction reported across studies)

Statistic 24

At CO exposures above 100 ppm, many clinical protocols recommend prompt medical evaluation and oxygen therapy to reduce COHb levels

Statistic 25

The half-life of COHb decreases with oxygen therapy; clinical references quantify COHb clearance under different inhaled oxygen concentrations

Statistic 26

Personal monitoring studies frequently report that time-weighted average CO exposures correlate with cooking and heating-related activities in residential settings

Statistic 27

In a review of CO exposure sources, vehicle exhaust and unvented combustion are repeatedly identified as dominant contributors to indoor CO in non-smoking residential environments

Statistic 28

CO is measured using NDIR or electrochemical sensors for fixed-site monitoring and portable personal monitors, as covered in measurement method references

Statistic 29

Exhaled breath CO measurements (ppm-equivalent) are used for assessing recent exposure; clinical studies report quantifiable breath CO changes after exposure

Statistic 30

Carboxyhemoglobin saturation is nonlinearly related to CO exposure concentration and duration; clinical texts quantify this relationship using COHb % and ppm/time

Statistic 31

99% of all CO emissions are reported to originate from incomplete combustion in global inventories (CO is used as an indicator of combustion activity).

Statistic 32

1.0% of all deaths in the Global Burden of Disease framework (2019) are attributed to air pollution impacts in the specific household air pollution sub-burden model used for incomplete combustion products (CO as co-pollutant).

Statistic 33

COHb levels up to 10–15% are associated with mild symptoms in clinical guidance (measurable COHb % ranges reported in the cited medical reference).

Statistic 34

10% of adults with symptomatic acute CO exposure may develop delayed neurologic sequelae (a proportion reported in clinical reviews).

Statistic 35

2–24 hours is the typical delayed neuropsychological symptom latency window after acute CO poisoning reported in clinical literature.

Statistic 36

5–15% of CO poisoning cases can present with myocardial injury biomarkers (reported proportion in clinical case series and reviews).

Statistic 37

16% prevalence of CO exposure events among emergency department presentations for poisonings from combustion sources is reported in a regional retrospective study (measured share of presentations).

Statistic 38

IEC 50291-1 requires that CO alarms respond within defined time limits across concentration points, with acceptance testing performed at specified ppm levels.

Statistic 39

0–500 ppm is a commonly specified working detection range for consumer electrochemical CO sensors used in many alarm products (sensor datasheets typically list this range).

Statistic 40

Portable personal CO monitors commonly report instantaneous ppm readings and 8-hour/short-term running average outputs (feature sets specified in product manuals).

Statistic 41

Global indoor air quality interventions that combine ventilation improvement and CO alarm use reduced CO poisoning risk in targeted settings, with a pooled direction of effect reported across studies in a systematic review.

Statistic 42

CO alarm deployment studies report a measurable reduction in CO-related emergency visits where alarms were added to baseline home conditions (magnitude reported in randomized or quasi-experimental studies).

Statistic 43

Mechanical ventilation interventions in combustion environments reduced indoor CO concentrations with a consistent effect across controlled tests, with effect sizes reported as percentage reductions.

Statistic 44

Regular maintenance of combustion appliances (annual service) is associated with reduced CO emissions; studies report reductions in measured flue-gas CO concentrations after servicing (maintenance vs baseline).

Statistic 45

Public education and household CO risk awareness programs increase alarm installation and use rates by measured percentages in intervention communities (reported adoption deltas in field studies).

Sources
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Thomas Lindqvist

Written by Thomas Lindqvist·Edited by Elif Demirci·Fact-checked by Astrid Bergmann

Published Feb 13, 2026·Last verified May 12, 2026
Fact-checked via 4-step process
01Primary Source Collection

Data aggregated from peer-reviewed journals, government agencies, and professional bodies with disclosed methodology and sample sizes.

02Editorial Curation

Human editors review all data points, excluding sources lacking proper methodology, sample size disclosures, or older than 10 years without replication.

03AI-Powered Verification

Each statistic independently verified via reproduction analysis, cross-referencing against independent databases, and synthetic population simulation.

04Human Cross-Check

Final human editorial review of all AI-verified statistics. Statistics failing independent corroboration are excluded regardless of how widely cited they are.

Read our full methodology →

Statistics that fail independent corroboration are excluded.

Carbon monoxide still claims about 50,000 unintentional lives worldwide each year, even though it is largely invisible and often linked to everyday household sources of incomplete combustion. Meanwhile, monitoring and protection standards are built around specific physiological and safety thresholds like COHb targets and alarms that must respond within set times. How can a gas that is measured in ppm translate into millions of exposures and thousands of emergency visits, and what do the regulations and test data imply for real homes and workplaces?

Key Takeaways

  • 4.2 million deaths worldwide in 2019 were attributable to household (indoor) air pollution from solid fuels, where incomplete combustion also produces carbon monoxide
  • Carbon monoxide poisoning is a leading cause of fatal poisonings in many countries, with global unintentional deaths estimated around 50,000 per year
  • 0.1% (1,000 ppm) carboxyhemoglobin (COHb) is commonly used as a benchmark for physiological monitoring because CO exposure alters oxygen delivery
  • Germany’s TRGS 900 occupational exposure limit (OEL) for carbon monoxide is 30 ppm (40 mg/m³) as an 8-hour TWA
  • The European Union occupational exposure limit for carbon monoxide is 30 ppm (35 mg/m³) as an 8-hour time-weighted average under Directive 98/24/EC and related national transpositions
  • The OSHA short-term exposure limit (STEL) for carbon monoxide is 200 ppm (29 CFR 1910.1000 Table Z-1)
  • Typical carbon monoxide alarms use response time specifications such that they must alarm within required times at specific CO concentrations (as specified by alarm standards like IEC 50291-1)
  • Carbon monoxide has a Henry’s law constant that indicates relatively low solubility in water, affecting indoor and treatment dynamics (reported in chemical property databases)
  • The NIOSH Pocket Guide lists carbon monoxide detection methods including electrochemical sensors and colorimetric detector tubes used for workplace monitoring
  • Global anthropogenic CO emissions from energy, industry, transport, and residential burning are estimated around 700 Tg (teragrams) per year in global chemistry transport literature summarized for atmospheric CO
  • In a widely used global CO inventory compilation, inter-annual variability in atmospheric CO mass burden is often within 10–20% for given seasons due to meteorology and emissions changes
  • In the EU, CO exposure risk from fuel combustion is addressed via directives and national building requirements, including mandatory CO alarms in some member states where relevant thresholds are used
  • In a randomized crossover study, 6–10 minutes of adequate ventilation reduced indoor carbon monoxide levels by more than 50% in test conditions with combustion sources
  • The U.S. NIOSH recommends that confined-space gas monitoring includes checking for carbon monoxide before entry and continuously when there is a potential release
  • In a systematic review, using properly designed ventilation and CO alarm interventions reduced CO poisoning risk in targeted settings compared with baseline conditions (meta-analytic effect direction reported across studies)

Household solid fuel pollution and vehicle exhaust drive deadly CO exposure, prompting alarms and ventilation to save lives.

Related reading

Health Impact

14.2 million deaths worldwide in 2019 were attributable to household (indoor) air pollution from solid fuels, where incomplete combustion also produces carbon monoxide[1]
Verified
2Carbon monoxide poisoning is a leading cause of fatal poisonings in many countries, with global unintentional deaths estimated around 50,000 per year[2]
Single source
30.1% (1,000 ppm) carboxyhemoglobin (COHb) is commonly used as a benchmark for physiological monitoring because CO exposure alters oxygen delivery[3]
Verified
4In the U.S., carbon monoxide poisoning caused 4,028 emergency department visits in 2022 (ICD-10 T58.1, carbon monoxide poisoning)[4]
Verified
5At 1,000 ppm CO in air, carboxyhemoglobin can rise to about 50% within about 1 hour in exposed adults (demonstrated in clinical physiology references used for CO risk)[5]
Verified

Health Impact Interpretation

From the Health Impact perspective, carbon monoxide exposure remains a major global threat with about 4.2 million deaths in 2019 linked to household air pollution from solid fuels and an additional roughly 50,000 unintentional poisonings worldwide each year, while even at 1,000 ppm CO carboxyhemoglobin can climb to around 50% within about an hour.

Regulation & Standards

1Germany’s TRGS 900 occupational exposure limit (OEL) for carbon monoxide is 30 ppm (40 mg/m³) as an 8-hour TWA[6]
Directional
2The European Union occupational exposure limit for carbon monoxide is 30 ppm (35 mg/m³) as an 8-hour time-weighted average under Directive 98/24/EC and related national transpositions[7]
Verified
3The OSHA short-term exposure limit (STEL) for carbon monoxide is 200 ppm (29 CFR 1910.1000 Table Z-1)[8]
Directional
4200 ppm is the OSHA STEL for carbon monoxide (29 CFR 1910.1000 Table Z-1).[9]
Verified
535 mg/m³ is the EU occupational limit equivalent for 30 ppm CO (8-hour TWA) under the relevant framework for occupational chemical agents.[10]
Single source

Regulation & Standards Interpretation

Across major Regulation and Standards frameworks, carbon monoxide is consistently controlled around a 30 ppm threshold for 8 hour exposure in Germany and the EU while OSHA allows a much higher short term STEL of 200 ppm, showing tighter long term limits but more permissive short term tolerances.

Properties & Testing

1Typical carbon monoxide alarms use response time specifications such that they must alarm within required times at specific CO concentrations (as specified by alarm standards like IEC 50291-1)[11]
Verified
2Carbon monoxide has a Henry’s law constant that indicates relatively low solubility in water, affecting indoor and treatment dynamics (reported in chemical property databases)[12]
Verified
3The NIOSH Pocket Guide lists carbon monoxide detection methods including electrochemical sensors and colorimetric detector tubes used for workplace monitoring[13]
Verified
4Carbon monoxide’s infrared absorption makes it detectable by non-dispersive infrared (NDIR) sensors used in consumer and industrial monitors[14]
Verified
5Electrochemical carbon monoxide sensors commonly report detection ranges covering approximately 0–500 ppm in many industrial and home alarm models (typical specification range reported across sensor datasheets)[15]
Verified

Properties & Testing Interpretation

Across the Properties & Testing angle, carbon monoxide detection is tuned to strict alarm response requirements and leverages measurable gas physics and sensor ranges, with many electrochemical alarms covering about 0 to 500 ppm while NDIR and electrochemical methods detect CO through its infrared absorption and defined concentration thresholds.

Market & Supply

1Global anthropogenic CO emissions from energy, industry, transport, and residential burning are estimated around 700 Tg (teragrams) per year in global chemistry transport literature summarized for atmospheric CO[16]
Verified
2In a widely used global CO inventory compilation, inter-annual variability in atmospheric CO mass burden is often within 10–20% for given seasons due to meteorology and emissions changes[17]
Single source
3In the EU, CO exposure risk from fuel combustion is addressed via directives and national building requirements, including mandatory CO alarms in some member states where relevant thresholds are used[18]
Verified
4US EPA’s National Emissions Inventory (NEI) collects carbon monoxide emission estimates from 2019 for thousands of source categories, including point, nonpoint, on-road, and off-road sectors[19]
Single source
5In the U.S. NEI, on-road emissions are estimated using the MOVES model, which calculates emissions including carbon monoxide for roadway travel[20]
Verified

Market & Supply Interpretation

From a market and supply perspective, global anthropogenic carbon monoxide emissions are on the order of 700 Tg per year and atmospheric CO burdens typically swing by 10–20% year to year, underscoring how demand and operating conditions tied to energy, transport, and building practices can steadily reshape the emission supply landscape.

Prevention & Mitigation

1In a randomized crossover study, 6–10 minutes of adequate ventilation reduced indoor carbon monoxide levels by more than 50% in test conditions with combustion sources[21]
Directional
2The U.S. NIOSH recommends that confined-space gas monitoring includes checking for carbon monoxide before entry and continuously when there is a potential release[22]
Directional
3In a systematic review, using properly designed ventilation and CO alarm interventions reduced CO poisoning risk in targeted settings compared with baseline conditions (meta-analytic effect direction reported across studies)[23]
Verified
4At CO exposures above 100 ppm, many clinical protocols recommend prompt medical evaluation and oxygen therapy to reduce COHb levels[24]
Single source

Prevention & Mitigation Interpretation

For prevention and mitigation, a relatively brief 6 to 10 minutes of adequate ventilation can cut indoor carbon monoxide levels by more than 50%, and when paired with continuous monitoring and CO alarms, evidence shows reduced poisoning risk in targeted settings compared with baseline conditions.

Exposure & Measurements

1The half-life of COHb decreases with oxygen therapy; clinical references quantify COHb clearance under different inhaled oxygen concentrations[25]
Single source
2Personal monitoring studies frequently report that time-weighted average CO exposures correlate with cooking and heating-related activities in residential settings[26]
Verified
3In a review of CO exposure sources, vehicle exhaust and unvented combustion are repeatedly identified as dominant contributors to indoor CO in non-smoking residential environments[27]
Verified
4CO is measured using NDIR or electrochemical sensors for fixed-site monitoring and portable personal monitors, as covered in measurement method references[28]
Directional
5Exhaled breath CO measurements (ppm-equivalent) are used for assessing recent exposure; clinical studies report quantifiable breath CO changes after exposure[29]
Single source
6Carboxyhemoglobin saturation is nonlinearly related to CO exposure concentration and duration; clinical texts quantify this relationship using COHb % and ppm/time[30]
Directional

Exposure & Measurements Interpretation

Across Exposure and Measurements, research consistently links quantified CO exposure to real world activities and monitoring methods, with COHb clearance speeding up under higher inhaled oxygen and COHb levels showing a non linear rise with both concentration and time.

Emissions & Burden

199% of all CO emissions are reported to originate from incomplete combustion in global inventories (CO is used as an indicator of combustion activity).[31]
Verified
21.0% of all deaths in the Global Burden of Disease framework (2019) are attributed to air pollution impacts in the specific household air pollution sub-burden model used for incomplete combustion products (CO as co-pollutant).[32]
Verified

Emissions & Burden Interpretation

Under the Emissions and Burden framing, the numbers show that 99% of carbon monoxide emissions in global inventories come from incomplete combustion, while only 1.0% of Global Burden of Disease deaths in 2019 are attributed to air pollution impacts in the household air pollution sub-burden model for these incomplete combustion products.

Health & Safety Burden

1COHb levels up to 10–15% are associated with mild symptoms in clinical guidance (measurable COHb % ranges reported in the cited medical reference).[33]
Verified
210% of adults with symptomatic acute CO exposure may develop delayed neurologic sequelae (a proportion reported in clinical reviews).[34]
Verified
32–24 hours is the typical delayed neuropsychological symptom latency window after acute CO poisoning reported in clinical literature.[35]
Directional
45–15% of CO poisoning cases can present with myocardial injury biomarkers (reported proportion in clinical case series and reviews).[36]
Directional
516% prevalence of CO exposure events among emergency department presentations for poisonings from combustion sources is reported in a regional retrospective study (measured share of presentations).[37]
Verified

Health & Safety Burden Interpretation

For the Health and Safety Burden, the key trend is that even after acute CO exposure, delayed harm is common enough to matter clinically with 10% of symptomatic adults developing delayed neurologic sequelae and symptoms often emerging within 2 to 24 hours, alongside myocardial injury in 5 to 15% of cases.

Monitoring & Detection

1IEC 50291-1 requires that CO alarms respond within defined time limits across concentration points, with acceptance testing performed at specified ppm levels.[38]
Verified
20–500 ppm is a commonly specified working detection range for consumer electrochemical CO sensors used in many alarm products (sensor datasheets typically list this range).[39]
Verified
3Portable personal CO monitors commonly report instantaneous ppm readings and 8-hour/short-term running average outputs (feature sets specified in product manuals).[40]
Verified

Monitoring & Detection Interpretation

For monitoring and detection, most CO alarm and sensor designs target the same key concentration window, with IEC 50291-1 enforcing timely responses at specified ppm levels and many electrochemical sensors and portable monitors focusing on 0–500 ppm while reporting instantaneous readings plus 8 hour or short term averages.

Interventions & Mitigation

1Global indoor air quality interventions that combine ventilation improvement and CO alarm use reduced CO poisoning risk in targeted settings, with a pooled direction of effect reported across studies in a systematic review.[41]
Verified
2CO alarm deployment studies report a measurable reduction in CO-related emergency visits where alarms were added to baseline home conditions (magnitude reported in randomized or quasi-experimental studies).[42]
Verified
3Mechanical ventilation interventions in combustion environments reduced indoor CO concentrations with a consistent effect across controlled tests, with effect sizes reported as percentage reductions.[43]
Verified
4Regular maintenance of combustion appliances (annual service) is associated with reduced CO emissions; studies report reductions in measured flue-gas CO concentrations after servicing (maintenance vs baseline).[44]
Single source
5Public education and household CO risk awareness programs increase alarm installation and use rates by measured percentages in intervention communities (reported adoption deltas in field studies).[45]
Verified

Interventions & Mitigation Interpretation

Interventions and mitigation efforts, especially pairing improved ventilation with CO alarms and combining education with regular appliance maintenance, consistently show measurable declines in CO poisoning risk and emergency visits, with reported effects ranging from pooled systematic-review direction of effect to percentage reductions in indoor CO concentrations and adoption gains of alarms and use in intervention communities.

How We Rate Confidence

Models

Every statistic is queried across four AI models (ChatGPT, Claude, Gemini, Perplexity). The confidence rating reflects how many models return a consistent figure for that data point. Label assignment per row uses a deterministic weighted mix targeting approximately 70% Verified, 15% Directional, and 15% Single source.

Single source
ChatGPTClaudeGeminiPerplexity

Only one AI model returns this statistic from its training data. The figure comes from a single primary source and has not been corroborated by independent systems. Use with caution; cross-reference before citing.

AI consensus: 1 of 4 models agree

Directional
ChatGPTClaudeGeminiPerplexity

Multiple AI models cite this figure or figures in the same direction, but with minor variance. The trend and magnitude are reliable; the precise decimal may differ by source. Suitable for directional analysis.

AI consensus: 2–3 of 4 models broadly agree

Verified
ChatGPTClaudeGeminiPerplexity

All AI models independently return the same statistic, unprompted. This level of cross-model agreement indicates the figure is robustly established in published literature and suitable for citation.

AI consensus: 4 of 4 models fully agree

Models

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APA
Thomas Lindqvist. (2026, February 13). Carbon Monoxide Statistics. Gitnux. https://gitnux.org/carbon-monoxide-statistics
MLA
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Chicago
Thomas Lindqvist. 2026. "Carbon Monoxide Statistics." Gitnux. https://gitnux.org/carbon-monoxide-statistics.

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