The concentration of carbon dioxide in the Earth's atmosphere is commonly measured in parts per million (ppm).
The table below shows the average concentration of carbon dioxide in the atmosphere in October 2005 and in October 2023.
| Date | Concentration of carbon dioxide in ppm |
|---|---|
| October 2005 | 379.82 |
| October 2023 | 420.46 |
Calculate the increase in the concentration of carbon dioxide in the atmosphere, in ppm, from October 2005 to October 2023.
Give your answer to the nearest whole number.
Practise Edexcel GCSE Chemistry Earth and atmospheric science with exam-style questions for Foundation and Higher tier. 62 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
