While outdoor atmospheric CO₂ levels are currently around 420 ppm, concentrations in enclosed spaces can rise much higher. 1000 ppm is often cited as a commonly referenced upper limit for acceptable indoor air quality. Levels above this indicate poor ventilation and can lead to symptoms like drowsiness and headaches for some people.
The safe threshold limit of CO₂ concentration in the atmosphere in ppm is :
Asked in OPSC CS Prelims 2017 · Topic: Greenhouse Effect and Climate Change (Composition, Sources, and Radiative Forcing of Major Greenhouse Gases (GHGs))
More Environment and Ecology questions
- Which among the following is the most abundant Green-House-Gas (GHG) in the earth's atmosphere ?
- Which of the following is the most important greenhouse gas in the earth's atmosphere ?
- In terms of efficiency, the most potent greenhouse gas is :
- Gases that trap heat in the atmosphere and cause global warming are called greenhouse gases. Which of the following combinations are not included under the greenhouse gases?
- The targets for the first commitment period of the Kyoto Protocol cover emissions of the six main greenhouse gases. Which of the following gas is not one of these ?
- The relative contributions of carbon dioxide (CO₂), nitrous oxide (N₂O), chlorofluorocarbons (CFCs) and methane (CH₄) towards global warming are
- Which of the following statements are true about greenhouse gases ?
- Which set of the following gases is most important for greenhouse effect ?