Carbon oxide

Carbon Monoxide ( ) is extremely dangerous substance to human health and life. It originates from the incomplete combustion of hydrocarbon fuels and some chemical reactions. No should be detected in inhabited premisses at any time. Trapped in the blood flow, Carbon Monoxide reacts with blood hemoglobin. Hemoglobin which combined with is unable to react with oxygen and transport it to the body cells.

Permissible levels of in the indoor air is very low due to it’s toxicity.

Regulatory levels

Regulations for industrial environments

  • OSHA
    • PEL = 50 ppm (TWA) - highest average concentration for any 8-hours period
  • MAK
    • 30 ppm - highest average concentration for any 8-hours period
    • 60 ppm - highest average concentration for any 30-min period
  • GOST 12.1.005-88 Occupational safety standards system. General sanitary requirements for working zone air
    • 20 - highest permissible concentration
    • 50 - highest permissible concentration for 1-hour exposure. Not less than 2 hours prior repetitive exposure
    • 100 - highest permissible concentration for 30-minutes exposure. Not less than 2 hours prior repetitive exposure
    • 200 - highest permissible concentration for 15-minutes exposure. Not less than 2 hours prior repetitive exposure

Outdoor air regulatory levels

  • U.S. EPA
    • 9 ppm - highest average concentration for any 8-hours period, not to be exceeded more than once a year
    • 35 ppm - highest average concentration for any 1-hour period, not to be exceeded more than once a year
  • California
    • 9 ppm (10 ) - highest average concentration for any 8-hours period, not to be exceeded more than once a year
    • 20 ppm (23 ) - highest average concentration for any 1-hour period, not to be exceeded more than once a year
  • Japan
    • 10 ppm - highest average concentration for any 24-hours period
    • 20 ppm - highest average concentration for any 8-hours period

Reference levels

Reference levels for industrial environments

  • NIOSH:
    • REL = 35 ppm - a workplace exposure limit - *Time Weighted Average (TWA) for exposure of 8 hours/day, 40 hours/week, for a working lifetime
    • 200 ppm - maximum exposure
  • ACGIH
    • 25 ppm - highest average concentration for any 8-hours period

General reference levels

  • ASHRAE
    • 9 ppm - 8 hours exposure
  • WHO:
    • 90 ppm - highest average concentration for any 15-min period
    • 50 ppm - highest average concentration for any 30-min period
    • 25 ppm - highest average concentration for any 1-hour period
    • 10 ppm - highest average concentration for any 8-hours period

Indoor residential reference levels

  • South Korea
    • 10 ppm
  • Canadian regulations
    • 25 ppm - highest average concentration for any 1-hour period
    • 11 ppm - highest average concentration for any 8-hours period

Carbon Monoxide detectors available on market as separate units. It is highly advised to install such detectors in premisses with appliances which combusting fossil fuels or adjacent to such premisses.