Editing Carbon dioxide (section)

==== Indoor air ====
Humans spend more and more time in a confined atmosphere (around 80-90% of the time in a building or vehicle). According to the French [[Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail|Agency for Food, Environmental and Occupational Health & Safety]] (ANSES) and various actors in France, the {{CO2}} rate in the indoor air of buildings (linked to human or animal occupancy and the presence of [[combustion]] installations), weighted by air renewal, is "usually between about 350 and 2,500 ppm".<ref>{{Cite report |url=https://www.anses.fr/en/system/files/AIR2012sa0093Ra.pdf |title=Concentrations de CO2 dans l'air intérieur et effets sur la santé |date=July 2013 |publisher=ANSES |pages=294 |language=fr}}</ref>

In homes, schools, nurseries and offices, there are no systematic relationships between the levels of {{CO2}} and other pollutants, and indoor {{CO2}} is statistically not a good predictor of pollutants linked to outdoor road (or air, etc.) traffic.<ref>{{Cite journal |last1=Chatzidiakou |first1=Lia |last2=Mumovic |first2=Dejan |last3=Summerfield |first3=Alex |date=March 2015 |title=Is CO 2 a good proxy for indoor air quality in classrooms? Part 1: The interrelationships between thermal conditions, CO 2 levels, ventilation rates and selected indoor pollutants |url=http://journals.sagepub.com/doi/10.1177/0143624414566244 |journal=Building Services Engineering Research and Technology |language=en |volume=36 |issue=2 |pages=129–161 |doi=10.1177/0143624414566244 |s2cid=111182451 |issn=0143-6244}}</ref> {{CO2}} is the parameter that changes the fastest (with hygrometry and oxygen levels when humans or animals are gathered in a closed or poorly ventilated room). In poor countries, many open hearths are sources of {{CO2}} and CO emitted directly into the living environment.<ref>{{Cite journal |last1=Cetin |first1=Mehmet |last2=Sevik |first2=Hakan |date=2016 |title=INDOOR QUALITY ANALYSIS OF CO2 FOR KASTAMONU UNIVERSITY |url=http://www.universitypublications.net/proceedings/0903/pdf/H6V141.pdf |journal=Conference of the International Journal of Arts & Sciences |volume=9 |issue=3 |pages=71}}</ref>