diff --git a/.github/workflows/install-from-pypi.yml b/.github/workflows/install-from-pypi.yml
index c758b93299..c60675c013 100644
--- a/.github/workflows/install-from-pypi.yml
+++ b/.github/workflows/install-from-pypi.yml
@@ -15,7 +15,7 @@ name: Install from PyPi
 
 # runs on a push on main and at the end of every day
 on:
-  # triggering on push without branch name will run tests everytime
+  # triggering on push without branch name will run tests every time
   # there is a push on any branch
   # turn it on only if needed
   push:
@@ -36,7 +36,7 @@ jobs:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10"]
       # fail-fast set to False allows all other tests
-      # in the worflow to run regardless of any fail
+      # in the workflow to run regardless of any fail
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
diff --git a/esmvalcore/cmor/_fixes/obs4mips/airs_2_1.py b/esmvalcore/cmor/_fixes/obs4mips/airs_2_1.py
new file mode 100644
index 0000000000..93ca03eaa6
--- /dev/null
+++ b/esmvalcore/cmor/_fixes/obs4mips/airs_2_1.py
@@ -0,0 +1,35 @@
+"""Fixes for obs4MIPs dataset AIRS-2-1."""
+from iris.exceptions import CoordinateNotFoundError
+
+from ..fix import Fix
+
+
+class AllVars(Fix):
+    """Common fixes to all vars."""
+
+    def fix_metadata(self, cubes):
+        """
+        Fix metadata.
+
+        Change unit of coordinate plev from hPa to Pa.
+
+        Parameters
+        ----------
+        cubes: iris.cube.CubeList
+            Input cubes.
+
+        Returns
+        -------
+        iris.cube.CubeList
+            Fixed cubes.
+
+        """
+        for cube in cubes:
+            try:
+                plev = cube.coord('air_pressure')
+            except CoordinateNotFoundError:
+                continue
+            else:
+                if plev.points[0] > 10000.0:
+                    plev.units = 'Pa'
+        return cubes
diff --git a/tests/integration/cmor/_fixes/obs4mips/test_airs_2_1.py b/tests/integration/cmor/_fixes/obs4mips/test_airs_2_1.py
new file mode 100644
index 0000000000..4ac2ce7f26
--- /dev/null
+++ b/tests/integration/cmor/_fixes/obs4mips/test_airs_2_1.py
@@ -0,0 +1,77 @@
+"""Test AIRS-2-1 fixes."""
+import numpy as np
+from iris.coords import DimCoord
+from iris.cube import Cube, CubeList
+
+from esmvalcore.cmor._fixes.obs4mips.airs_2_1 import AllVars
+from esmvalcore.cmor.fix import Fix
+
+
+def get_air_pressure_coord(points, units):
+    """Get ``air_pressure`` coordinate."""
+    return DimCoord(points, var_name='plev', standard_name='air_pressure',
+                    long_name='pressure', units=units)
+
+
+def test_get_allvars_fix():
+    """Test getting of fix."""
+    fix = Fix.get_fixes('obs4MIPs', 'AIRS-2-1', 'Amon', 'cl')
+    assert fix == [AllVars(None)]
+
+
+def test_allvars_fix_no_air_pressure():
+    """Test fix for all variables."""
+    cubes = CubeList([Cube(0.0, var_name='cl')])
+    fix = AllVars(None)
+    out_cubes = fix.fix_metadata(cubes.copy())
+
+    assert len(out_cubes) == 1
+    assert out_cubes[0] == cubes[0]
+
+
+def test_allvars_fix_correct_air_pressure_pa():
+    """Test fix for all variables."""
+    air_pressure_coord = get_air_pressure_coord([100000.0, 80000.0], 'Pa')
+    cube = Cube([0.0, 1.0], var_name='cl',
+                dim_coords_and_dims=[(air_pressure_coord, 0)])
+    cubes = CubeList([cube])
+    fix = AllVars(None)
+    out_cubes = fix.fix_metadata(cubes.copy())
+
+    assert len(out_cubes) == 1
+    assert out_cubes[0] == cubes[0]
+    assert out_cubes[0].coord('air_pressure').units == 'Pa'
+    np.testing.assert_allclose(out_cubes[0].coord('air_pressure').points,
+                               [100000.0, 80000.0])
+
+
+def test_allvars_fix_correct_air_pressure_hpa():
+    """Test fix for all variables."""
+    air_pressure_coord = get_air_pressure_coord([1000.0, 800.0], 'hPa')
+    cube = Cube([0.0, 1.0], var_name='cl',
+                dim_coords_and_dims=[(air_pressure_coord, 0)])
+    cubes = CubeList([cube])
+    fix = AllVars(None)
+    out_cubes = fix.fix_metadata(cubes.copy())
+
+    assert len(out_cubes) == 1
+    assert out_cubes[0] == cubes[0]
+    assert out_cubes[0].coord('air_pressure').units == 'hPa'
+    np.testing.assert_allclose(out_cubes[0].coord('air_pressure').points,
+                               [1000.0, 800.0])
+
+
+def test_allvars_fix_incorrect_air_pressure():
+    """Test fix for all variables."""
+    air_pressure_coord = get_air_pressure_coord([100000.0, 80000.0], 'hPa')
+    cube = Cube([0.0, 1.0], var_name='cl',
+                dim_coords_and_dims=[(air_pressure_coord, 0)])
+    cubes = CubeList([cube])
+    fix = AllVars(None)
+    out_cubes = fix.fix_metadata(cubes.copy())
+
+    assert len(out_cubes) == 1
+    assert out_cubes[0] != cubes[0]
+    assert out_cubes[0].coord('air_pressure').units == 'Pa'
+    np.testing.assert_allclose(out_cubes[0].coord('air_pressure').points,
+                               [100000.0, 80000.0])