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# Carbon Dioxide Concentration in Rooms Occupied with People

## Carbon dioxide concentration in a room may indicate air quality and ventilation system efficiency.

The carbon dioxide concentration in a room can be used to indicate air quality.

The Carbon dioxide concentration in a room filled with persons after a time - t - can be calculated as

c = (q / (n V)) [1 - (1 / en t)] + (c0 - ci) (1 / en t) + ci                              (1)

where

c= carbon dioxide concentration in the room (m3/m3)

q= carbon dioxide supplied to the room (m3/h)

V= volume of the room (m3)

e= the constant 2.718.....

n= number of air shifts per hour (1/h)

t= time (hour, h)

ci= carbon dioxide concentration in the inlet ventilation air (m3/m3)

c0= carbon dioxide concentration in the room at start,t=0(m3/m3)

Note that this equation can be used to calculate the concentration of any pollution as long as the pollution substance is homogeneous mixed with the air.

### CO2 Concentration Calculator

*) normal carbon dioxide concentration in outside air is aprox. 400 ppm (0.0004 m3/m3).

### Example - Carbon Dioxide Concentration in a Cinema

With an approximately carbon dioxide emission per person in a cinema of 0.05 m3/h - the CO2 emission from 100 persons can be calculated to approximately 5 m3/h.

If the carbon dioxide concentration when people enters the room - and in the inlet air - is close to zero, the CO2 pollution concentration in a 500 m3 cinema after one hour and with one air shift per hour, can be calculated as:

c =( (5 m3/h) / (1 h-1) (500 m3) ) [1 - (1 / e((1 1/h) (1 h))] + ((0 m3/m3) - (0.0004 m3/m3)) (1 / e(1 1/h)(1 h)) + (0.0004 m3/m3)

= 0.0067 m3/m3 (6700 ppm)

Note! - that with 6700 ppm(0.0067 m3/m3) of CO2 in the air - adverse health effects may be expected. One air shift per hour as used in this example is not enough.

## Related Topics

• ### Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• ### Physiology

Human physiology vs. air quality, comfort temperatures, activity and metabolic rates. Health effects of gases adn polutions like carbon monoxide and more.
• ### Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

## Related Documents

• ### Air - Diffusion Coefficients of Gases in Excess of Air

Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C.
• ### Air Contaminants - Exposure Limits

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• ### Ammonia - NH3 - Concentration in Air and Health Effects

Ammonia and health symptoms - smell and threat to life.
• ### Carbon Dioxide - CO2 - Liquid - Properties, Imperial Units

Properties of saturated liquid Carbon Dioxide - CO2 - density, specific heat, kinematic viscosity, thermal conductivity and Prandtl number.
• ### Carbon dioxide - Density and Specific Weight vs. Temperature and Pressure

Online calculator, figures and tables showing density and specific weight of carbon dioxide, CO2, at temperatures ranging from -50 to 775 °C (-50 to 1400 °F) at atmospheric and higher pressure - Imperial and SI Units.
• ### Carbon Dioxide - Liquid Properties

Properties of saturated liquid Carbon Dioxide - CO2 - density, specific heat, kinematic viscosity, thermal conductivity and Prandtl number.
• ### Carbon dioxide - Prandtl Number vs. Temperature and Pressure

Figures and table with changes in Prandtl number for carbon dioxide with changes in temperature and pressure.
• ### Carbon Dioxide - Specific Heat of Gas vs. Temperature

Specific heat of Carbon Dioxide gas - CO2 - temperatures ranging 175 - 6000 K.
• ### Carbon Dioxide - Thermophysical Properties

Chemical, physical and thermal properties of carbon dioxide. Phase diagram included.
• ### Carbon Dioxide Concentration - Comfort Levels

CO2 acceptance and comfort level.
• ### Carbon Dioxide Emission from the Human Body vs. Activity

Carbon Dioxide emission from persons vs. activity.
• ### Carbon Monoxide and Health Effects

Exposure to Carbon Monoxide - CO and health effects.
• ### Clo - Clothing and Thermal Insulation

Clo is used as a measure of clothes thermal insulation.
• ### Concentration of Carbon Dioxide in the Atmosphere

The atmospheric Carbon Dioxide concentration year 1959 - 2015.
• ### Gases Solved in Water - Diffusion Coefficients

Diffusion flux [kg/m2s] tells how fast a substanse solved in another substance flows due to concentration gradients. Diffusion constants [m2/s] for several gases in water.
• ### Human Need of Air

Fresh air is required for respiration and for transport of heat and vapor emitted from the human body.
• ### Pollution Concentration in Rooms

Concentration of a pollution in a limited space as a room depends on the amount of polluted material spread in the room, supply of fresh air, outlets positions and construction, principles used for supply and outlet from the space.

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## Citation

This page can be cited as

• The Engineering ToolBox (2004). Carbon Dioxide Concentration in Rooms Occupied with People. [online] Available at: https://www.engineeringtoolbox.com/pollution-concentration-rooms-d_692.html [Accessed Day Month Year].

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6.3.17

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