Climate TrendsNitrous oxide (N₂O): global average concentration
Latest month339.82 ppbMay 2026
vs 12 months earlier+1.17 ppb
vs 2001×1.072001→2025
Largest yearly rise2022+1.34 ppb
Yearly increase
+0.58 ppb
+0.69 ppb
+0.63 ppb
+0.66 ppb
+0.91 ppb
+0.62 ppb
+1.06 ppb
+0.77 ppb
+0.91 ppb
+1.02 ppb
+0.84 ppb
+0.89 ppb
+1.15 ppb
+1.08 ppb
+0.78 ppb
+0.79 ppb
+1.17 ppb
+0.96 ppb
+1.13 ppb
+1.28 ppb
+1.34 ppb
+1.07 ppb
+1.03 ppb
+1.14 ppb
Annual means
| Year | Annual mean | Change |
|---|---|---|
| 2025 | 338.86 ppb | +1.14 |
| 2024 | 337.72 ppb | +1.03 |
| 2023 | 336.69 ppb | +1.07 |
| 2022 | 335.63 ppb | +1.34 |
| 2021 | 334.28 ppb | +1.28 |
| 2020 | 333.01 ppb | +1.13 |
| 2019 | 331.88 ppb | +0.96 |
| 2018 | 330.92 ppb | +1.17 |
| 2017 | 329.75 ppb | +0.79 |
| 2016 | 328.96 ppb | +0.78 |
| 2015 | 328.17 ppb | +1.08 |
| 2014 | 327.10 ppb | +1.15 |
| 2013 | 325.95 ppb | +0.89 |
| 2012 | 325.06 ppb | +0.84 |
| 2011 | 324.22 ppb | +1.02 |
| 2010 | 323.19 ppb | +0.91 |
| 2009 | 322.28 ppb | +0.77 |
| 2008 | 321.51 ppb | +1.06 |
| 2007 | 320.45 ppb | +0.62 |
| 2006 | 319.83 ppb | +0.91 |
| 2005 | 318.92 ppb | +0.66 |
| 2004 | 318.26 ppb | +0.63 |
| 2003 | 317.63 ppb | +0.69 |
| 2002 | 316.94 ppb | +0.58 |
| 2001 | 316.36 ppb | – |
NOAA GML global mean from the marine surface network (monthly). Recent values are preliminary.