The concentration of planet-heating pollutants hit record levels in 2023
Monthly atmospheric greenhouse gas concentration
Carbon dioxide
parts per million
425
405
385
365
345
325
1984
2020
Nitrous oxide
parts per billion
340
330
320
310
300
1984
2020
Methane
parts per billion
2,000
1,900
1,800
1,700
1,600
1984
2020
Carbon dioxide
parts per million
425
405
385
365
345
325
1984
2020
Nitrous oxide
parts per billion
340
330
320
310
300
1984
2020
Methane
parts per billion
2,000
1,900
1,800
1,700
1,600
1984
2020
Carbon dioxide
parts per million
Methane
parts per billion
Nitrous oxide
parts per billion
2,000
425
340
405
1,900
330
385
1,800
320
365
1,700
310
345
1,600
325
300
1984
2020
1984
2020
1984
2020
Monthly atmospheric greenhouse gas concentration
Carbon dioxide
parts per million
Methane
parts per billion
Nitrous oxide
parts per billion
2,000
425
340
405
1,900
330
385
1,800
320
365
1,700
310
345
1,600
325
300
1984
2020
1984
2020
1984
2020
Methane
parts per billion
Carbon dioxide
parts per million
Nitrous oxide
parts per billion
2,000
425
340
405
1,900
330
385
1,800
320
365
1,700
310
345
1,600
325
300
1984
2020
1984
2020
1984
2020