Carbon dioxide levels and potential health problems are indicated below: 250-350 ppm: background (normal) outdoor air level 350-1,000 ppm: typical level found in occupied spaces with good air ...

4 August 2000 CO2 concentration safely monitoredCROWCON, based at Abingdon, Oxon, now offers a digital safety monitor for measuring carbon dioxide levels ...

CASE #3 would clear away the current excess of CO2 in the atmosphere, and then continue to reduce the atmospheric CO2 concentration to a very low level over the course of about 300 years.

The global average will catch up in a year or two, he said. Since scientists began measuring at Mauna Loa in 1958, the concentration of carbon dioxide has been increasing every year, NOAA said.

Scientists have known for a while now that the planet’s atmospheric concentration of carbon dioxide was nearing this point. On May 9, 2013, atmospheric CO2 levels rose above 400 ppm for the ...

Researchers measured the average atmospheric carbon dioxide to be 421.21 parts per million, which means that humans have reached the halfway point to doubling pre-industrial levels of CO2.

The concentration of carbon dioxide in the atmosphere this year is likely to show one of the largest annual rises since measurements began in 1958, partly fuelled by Australian bushfires ...