CO2 has risen to a level not seen since the 1990s in Cork as the Irish Rail and Maritime Co. (IRMC) and the Department of Environment and Heritage (DENH) face a challenge to keep it at bay as temperatures rise.

The CO2 level rose to 3,100 parts per million (ppm) on Monday in the city, which has recorded the lowest CO2 readings in decades.

It was the highest reading since records began in 1900.

The average CO2 reading in Cork, which sits on the border of Northern Ireland and the Republic, was 1,904ppm in February and 1,769ppm a month earlier.

A day earlier, it was 1.0ppm, a record low for the city.

CO2 is a greenhouse gas that traps heat and carbon dioxide, which can contribute to global warming.

Cork is one of the hottest cities in Ireland, with temperatures exceeding 40C in parts of the city and parts of rural areas.

CO 2 levels in Cork are likely to continue to rise as more CO2-rich coal from Ireland is mined in the north of the country.

In recent months, CO2 emissions have increased in the capital.

In January, the Irish Environment Agency (IEA) recorded a new CO2 concentration of 3,000ppm – the highest since the 1980s.

However, DENH said the level had remained stable.

“The CO2 concentrations are very stable in Cork.

It is a matter of increasing CO2 that is being mined from Ireland and that is not changing,” DENH director general, Paul Kelly, said.

On the other side of the world, CO 2 in China is at its lowest levels since the Industrial Revolution, with CO2 in Shanghai at 0.5ppm on Monday, less than half the level recorded in June and September.

China, which is the world’s biggest CO2 emitter, is already on track to achieve its 2020 CO2 cut target of 2,500ppm.

A CO2 spike in France and Germany, where the temperature has increased in recent years, will not have a significant impact on CO2 and emissions, DENC said.

In Paris, CO