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Declining Oxygen Level as an Emerging Concern to Global Cities
- Source :
- Environmental sciencetechnology. 55(12)
- Publication Year :
- 2021
-
Abstract
- Rising CO2 concentration and temperatures in urban areas are now well-known, but the potential of an emerging oxygen crisis in the world's large cities has so far attracted little attention from the science community. Here, we investigated the oxygen balance and its related risks in 391 global large cities (with a population of more than 1 million people) using the oxygen index (OI), which is the ratio of oxygen consumption to oxygen production. Our results show that the global urban areas, occupying only 3.8% of the global land surface, accounted for 39% (14.3 ± 1.5 Gt/yr) of the global terrestrial oxygen consumption during 2001-2015. We estimated that 75% of cities with a population more than 5 million had an OI of greater than 100. Also, cities with larger OI values were correlated with more frequent heatwaves and severe water withdrawals. In addition, cities with excessively large OI values would likely experience severe hypoxia in extremely calm weather. Thus, mitigation measures should be adopted to reduce the urban OI in order to build healthier and more sustainable cities.
- Subjects :
- Consumption (economics)
Risk
education.field_of_study
Index (economics)
Population
Hypoxia (environmental)
General Chemistry
Severe hypoxia
010501 environmental sciences
01 natural sciences
Oxygen balance
Oxygen
Geography
Co2 concentration
Environmental Chemistry
Humans
Cities
education
Socioeconomics
Oxygen level
Weather
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15205851
- Volume :
- 55
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- Environmental sciencetechnology
- Accession number :
- edsair.doi.dedup.....d84c566b169bb64fe15fc4c8c9745a68