The supply of Carbon Dioxide (CO2) in the atmosphere increases each year and each decade on-average the rate of increase over the prior decade increases. When the annual rate of change is increasing, we call this an acceleration. Therefore the supply of CO2 in the atmosphere is accelerating, based on data. Sources listed here:

Global Monitoring Laboratory – Carbon Cycle Greenhouse Gases (

At concentrations of from 2,500 ppm-v to 5,000 ppm-v CO2 can cause headaches. At extremely high levels of 100,000 ppm-v (10 volume percent) people lose consciousness in ten minutes, and at 200,000 ppm-v (20 volume percent) CO2 causes partial or complete closure of the glottis. Source:

Indoor Air Quality: Carbon Monoxide and Carbon Dioxide (AEN-125) • Department of Agricultural and Biosystems Engineering • Iowa State University (

Property ventilated buildings on-average have 700 to 870 ppm-v CO2 levels There is much confusion on an CO2 standard level for indoors. Some cite ASHRAE’s outdated CO2 level recommendation. The following NIST article sheds light onto this often times mis-referenced value, Source:

Quit Blaming ASHRAE Standard 62.1 for 1000 ppm CO2 | NIST

The primary source of CO2 in office buildings is respiration of the building occupants. CO2 concentrations in office buildings typically range from 350 to 2,500 ppm-v. Source:

base_3c2o2.pdf (