Explore Our Planet » CO2 Level / Monthly - it’s simply Global Warming and Climate Change

CO2 Level / Monthly

Since 1958 scientists at the Mauna Loa Observatory, Hawaii, measure the CO2 concentration. in the atmosphere.

Surprisingly the level of CO2 was and is constantly rising over years with a variance caused by the seasons.

You’ll find more land on the northern hemisphere and therefore during spring more CO2 is captured.

Later on by analyzing the isotopes it was shown that the source of the rising CO2 level is anthropogenic.

Data Credit goes to Dr. Pieter Tans, NOAA/Earth System Research Laboratory. Visit the NOAA site for more interesting details. The following table is updated ever Monday.

Units are ppm (parts per million) .

Year	Month	MLO - Average	MLO - Trend	Global - Average	Global - Trend
2008	Jul	385.60	385.25
2008	Jun	387.87	385.51	385.68	385.08
2008	May	388.47	385.46	386.51	384.82
2008	Apr	387.21	384.46	386.22	384.39
2008	Mar	385.94	384.50	385.96	384.34
2008	Feb	385.69	384.77	385.68	384.33
2008	Jan	385.37	385.18	385.04	384.06
2007	Dec	383.90	384.60	384.27	383.82
2007	Nov	382.38	384.48	383.24	383.57
2007	Oct	381.15	384.40	381.89	383.44
2007	Sep	380.73	384.06	380.50	383.21
2007	Aug	381.85	383.50	380.13	382.82
2007	Jul	384.35	383.99	381.39	382.63
2007	Jun	385.98	383.64	383.08	382.48
2007	May	386.54	383.52	383.95	382.27
2007	Apr	386.38	383.64	384.10	382.27
2007	Mar	384.51	383.06	383.81	382.20
2007	Feb	383.87	382.96	383.35	382.00
2007	Jan	382.91	382.71	382.82	381.84
2006	Dec	381.85	382.56	382.14	381.69
2006	Nov	380.17	382.26	381.18	381.50
2006	Oct	379.06	382.32	379.82	381.38
2006	Sep	378.81	382.13	378.42	381.13
2006	Aug	380.33	381.98	378.30	381.00
2006	Jul	382.15	381.78	379.86	381.10
2006	Jun	384.01	381.67	381.52	380.92
2006	May	384.94	381.91	382.38	380.69
2006	Apr	384.65	381.92	382.43	380.59
2006	Mar	382.65	381.18	382.10	380.49
2006	Feb	382.19	381.29	381.69	380.34
2006	Jan	381.36	381.15	381.05	380.07
2005	Dec	380.07	380.79	380.34	379.89
2005	Nov	378.29	380.37	379.36	379.68
2005	Oct	376.98	380.25	377.88	379.43
2005	Sep	376.72	380.02	376.56	379.27
2005	Aug	378.60	380.27	376.49	379.18
2005	Jul	380.60	380.22	377.72	378.96
2005	Jun	382.14	379.82	379.42	378.81
2005	May	382.45	379.41	380.24	378.56
2005	Apr	382.20	379.48	380.12	378.29
2005	Mar	380.91	379.43	379.61	378.00
2005	Feb	379.70	378.81	379.00	377.65
2005	Jan	378.43	378.20	378.58	377.60
2004	Dec	377.51	378.24	377.99	377.52
2004	Nov	376.15	378.22	377.00	377.29
2004	Oct	374.47	377.76	375.55	377.06
2004	Sep	374.10	377.39	374.23	376.86
2004	Aug	376.07	377.75	374.34	376.91
2004	Jul	377.48	377.08	375.80	376.94
2004	Jun	379.66	377.35	377.34	376.75
2004	May	380.62	377.56	378.21	376.60
2004	Apr	380.42	377.72	378.28	376.51
2004	Mar	378.88	377.39	377.92	376.38
2004	Feb	377.87	376.99	377.49	376.25
2004	Jan	377.03	376.79	376.97	376.06
2003	Dec	375.97	376.71	376.32	375.84
2003	Nov	374.67	376.70	375.48	375.73
2003	Oct	373.10	376.39	374.20	375.65
2003	Sep	373.12	376.44	372.90	375.46
2003	Aug	374.28	375.85	372.70	375.17
2003	Jul	376.65	376.11	373.94	375.03
2003	Jun	378.21	375.96	375.48	374.94
2003	May	378.54	375.68	376.33	374.79
2003	Apr	377.75	375.04	376.19	374.47
2003	Mar	376.51	374.95	375.72	374.25
2003	Feb	375.63	374.81	375.29	374.10
2003	Jan	374.92	374.72	374.75	373.85
2002	Dec	373.71	374.45	374.09	373.57
2002	Nov	372.19	374.16	373.09	373.27
2002	Oct	370.50	373.77	371.74	373.09
2002	Sep	370.72	374.02	370.48	372.97
2002	Aug	371.77	373.36	370.16	372.62
2002	Jul	373.91	373.40	371.24	372.39
2002	Jun	375.44	373.21	372.67	372.25
2002	May	375.58	372.79	373.52	372.09
2002	Apr	374.93	372.25	373.53	371.86
2002	Mar	373.87	372.26	373.19	371.75
2002	Feb	373.08	372.24	372.68	371.48
2002	Jan	372.38	372.18	372.31	371.36
2001	Dec	371.11	371.83	371.79	371.24
2001	Nov	369.64	371.64	370.86	371.06
2001	Oct	368.38	371.71	369.51	370.90
2001	Sep	368.12	371.45	368.17	370.70
2001	Aug	369.59	371.25	368.13	370.73
2001	Jul	371.51	370.92	369.28	370.56
2001	Jun	373.13	370.85	370.67	370.18
2001	May	373.77	370.90	371.57	370.02
2001	Apr	373.32	370.66	371.64	369.93
2001	Mar	372.39	370.83	371.30	369.81
2001	Feb	371.44	370.64	370.90	369.67
2001	Jan	370.47	370.24	370.45	369.50
2000	Dec	369.62	370.33	369.94	369.38
2000	Nov	368.27	370.31	369.12	369.31
2000	Oct	366.94	370.23	367.74	369.17
2000	Sep	366.87	370.19	366.50	369.11
2000	Aug	368.18	369.71	366.52	369.10
2000	Jul	369.69	369.04	367.68	368.83
2000	Jun	371.51	369.25	369.11	368.52
2000	May	371.32	368.45	370.05	368.47
2000	Apr	371.63	369.01	370.15	368.45
2000	Mar	370.38	368.90	369.80	368.37
2000	Feb	369.32	368.51	369.48	368.31
2000	Jan	369.07	368.87	369.20	368.26
1999	Dec	367.86	368.59	368.68	368.20
1999	Nov	366.51	368.58	367.85	368.06
1999	Oct	365.17	368.41	366.58	367.97
1999	Sep	364.61	367.95	365.26	367.79
1999	Aug	366.70	368.21	365.07	367.42
1999	Jul	369.10	368.42	366.40	367.33
1999	Jun	370.10	367.87	368.11	367.57
1999	May	370.66	367.84	368.97	367.52
1999	Apr	370.77	368.19	369.04	367.40
1999	Mar	369.46	367.90	368.64	367.32
1999	Feb	368.83	367.97	368.26	367.17
1999	Jan	367.97	367.79	367.88	366.98
1998	Dec	366.87	367.62	367.27	366.74
1998	Nov	365.36	367.40	366.45	366.64
1998	Oct	364.18	367.45	365.21	366.57
1998	Sep	363.83	367.20	363.87	366.39
1998	Aug	365.81	367.33	363.57	366.00
1998	Jul	367.59	366.88	364.59	365.56
1998	Jun	368.78	366.57	366.02	365.43
1998	May	369.33	366.48	366.58	365.12
1998	Apr	368.42	365.80	366.32	364.74
1998	Mar	366.95	365.39	365.69	364.40
1998	Feb	365.82	364.98	365.22	364.14
1998	Jan	365.00	364.86	364.91	363.98
1997	Dec	364.12	364.89	364.40	363.89
1997	Nov	362.21	364.29	363.34	363.58
1997	Oct	360.49	363.78	361.65	363.10
1997	Sep	360.05	363.45	360.13	362.72
1997	Aug	361.89	363.43	360.14	362.63
1997	Jul	364.10	363.33	361.68	362.69
1997	Jun	365.36	363.16	363.35	362.69
1997	May	366.47	363.58	364.24	362.68
1997	Apr	366.02	363.33	364.19	362.54
1997	Mar	364.25	362.70	363.68	362.32
1997	Feb	363.87	363.03	363.31	362.19
1997	Jan	362.81	362.64	362.98	362.08
1996	Dec	361.96	362.78	362.35	361.89
1996	Nov	360.62	362.74	361.52	361.83
1996	Oct	359.34	362.61	360.40	361.94
1996	Sep	359.41	362.78	359.41	362.07
1996	Aug	361.15	362.69	359.77	362.31
1996	Jul	363.31	362.61	361.27	362.26
1996	Jun	364.70	362.48	362.54	361.77
1996	May	364.93	361.91	362.94	361.27
1996	Apr	364.28	361.63	362.80	361.10
1996	Mar	363.91	362.36	362.46	361.06
1996	Feb	362.94	362.10	362.14	361.01
1996	Jan	361.83	361.68	361.81	360.93
1995	Dec	360.42	361.29	361.31	360.91
1995	Nov	359.22	361.35	360.44	360.73
1995	Oct	357.80	361.18	359.10	360.54
1995	Sep	357.93	361.36	357.72	360.26
1995	Aug	358.94	360.63	357.39	359.73
1995	Jul	361.55	360.96	358.67	359.57
1995	Jun	363.03	360.58	360.30	359.69
1995	May	363.62	360.42	361.14	359.63
1995	Apr	363.05	360.34	361.24	359.57
1995	Mar	361.60	359.99	360.78	359.42
1995	Feb	360.61	359.78	360.30	359.20
1995	Jan	359.73	359.59	359.83	358.97
1994	Dec	358.74	359.65	359.26	358.83
1994	Nov	357.41	359.50	358.40	358.70
1994	Oct	355.89	359.23	356.94	358.41
1994	Sep	355.42	358.78	355.72	358.31
1994	Aug	357.23	358.92	355.79	358.31
1994	Jul	359.20	358.63	356.99	358.04
1994	Jun	360.60	358.22	358.49	357.81
1994	May	361.48	358.30	359.43	357.80
1994	Apr	361.13	358.41	359.41	357.69
1994	Mar	359.67	358.05	359.05	357.62
1994	Feb	358.80	358.00	358.72	357.56
1994	Jan	358.05	357.95	358.19	357.30
1993	Dec	356.70	357.59	357.59	357.20
1993	Nov	355.27	357.38	356.69	357.05
1993	Oct	354.03	357.37	355.46	357.00
1993	Sep	353.96	357.39	354.22	356.88
1993	Aug	355.29	357.07	354.19	356.81
1993	Jul	357.36	356.87	355.50	356.64
1993	Jun	359.41	356.96	357.14	356.42
1993	May	360.07	356.85	358.15	356.37
1993	Apr	359.17	356.49	358.20	356.32
1993	Mar	358.26	356.53	357.73	356.21
1993	Feb	357.17	356.32	357.32	356.13
1993	Jan	356.76	356.63	356.98	356.13
1992	Dec	355.39	356.27	356.51	356.13
1992	Nov	354.15	356.29	355.75	356.10
1992	Oct	353.21	356.50	354.57	356.05
1992	Sep	352.80	356.25	353.31	355.93
1992	Aug	354.77	356.47	353.40	356.02
1992	Jul	356.72	356.25	354.99	356.14
1992	Jun	359.19	356.72	356.69	356.00
1992	May	359.45	356.19	357.60	355.85
1992	Apr	358.91	356.15	357.54	355.68
1992	Mar	357.73	356.13	357.06	355.56
1992	Feb	356.84	356.07	356.72	355.54
1992	Jan	356.08	355.94	356.39	355.52
1991	Dec	354.98	355.91	355.77	355.38
1991	Nov	353.70	355.86	354.92	355.26
1991	Oct	352.22	355.51	353.78	355.22
1991	Sep	352.20	355.57	352.75	355.31
1991	Aug	353.78	355.49	352.83	355.40
1991	Jul	355.96	355.45	354.33	355.45
1991	Jun	357.99	355.53	356.01	355.36
1991	May	359.00	355.75	356.89	355.20
1991	Apr	358.40	355.67	357.01	355.17
1991	Mar	357.00	355.40	356.48	354.99
1991	Feb	355.67	354.85	355.91	354.78
1991	Jan	354.87	354.75	355.51	354.67
1990	Dec	354.21	355.15	354.95	354.58
1990	Nov	352.81	354.95	354.22	354.58
1990	Oct	351.36	354.60	352.98	354.43
1990	Sep	351.05	354.28	351.57	354.11
1990	Aug	352.67	354.24	351.38	353.93
1990	Jul	354.67	354.04	352.50	353.62
1990	Jun	356.11	353.67	354.10	353.45
1990	May	357.08	353.90	355.19	353.51
1990	Apr	356.10	353.48	355.28	353.47
1990	Mar	355.49	354.01	354.94	353.45
1990	Feb	354.72	354.02	354.62	353.46
1990	Jan	353.63	353.55	354.22	353.36
1989	Dec	352.66	353.56	353.66	353.32
1989	Nov	351.26	353.34	352.79	353.06
1989	Oct	350.10	353.34	351.61	352.97
1989	Sep	349.83	352.96	350.35	352.81
1989	Aug	351.42	352.93	350.02	352.44
1989	Jul	353.79	353.10	351.37	352.40
1989	Jun	355.11	352.73	353.12	352.49
1989	May	355.70	352.57	354.04	352.42
1989	Apr	355.43	352.81	354.19	352.42
1989	Mar	353.64	352.26	353.81	352.39
1989	Feb	353.10	352.46	353.27	352.22
1989	Jan	352.72	352.69	352.83	352.10
1988	Dec	351.29	352.16	352.30	351.96
1988	Nov	349.99	352.07	351.42	351.68
1988	Oct	348.94	352.15	350.22	351.55
1988	Sep	348.84	351.98	349.07	351.49
1988	Aug	350.42	351.90	348.91	351.19
1988	Jul	352.53	351.78	350.09	350.96
1988	Jun	353.64	351.34	351.55	350.93
1988	May	354.14	351.04	352.24	350.74
1988	Apr	353.53	350.95	352.11	350.45
1988	Mar	352.22	350.77	351.64	350.33
1988	Feb	351.58	350.97	351.24	350.26
1988	Jan	350.23	350.23	350.68	349.95
1987	Dec	349.03	349.90	349.96	349.65
1987	Nov	347.80	349.91	349.00	349.31
1987	Oct	346.48	349.68	347.73	349.11
1987	Sep	346.37	349.49	346.47	348.84
1987	Aug	347.62	349.01	346.43	348.64
1987	Jul	349.77	348.97	347.69	348.51
1987	Jun	351.45	349.14	349.23	348.55
1987	May	351.84	348.80	350.00	348.48
1987	Apr	351.12	348.62	349.73	348.06
1987	Mar	349.56	348.19	349.03	347.69
1987	Feb	348.55	347.89	348.30	347.37
1987	Jan	348.20	348.17	347.75	347.11
1986	Dec	346.89	347.82	347.51	347.27
1986	Nov	345.67	347.80	347.08	347.44
1986	Oct	344.34	347.60	345.77	347.18
1986	Sep	344.88	347.99	344.59	347.02
1986	Aug	345.89	347.28	344.69	346.94
1986	Jul	347.78	346.99	346.06	346.85
1986	Jun	349.70	347.28	347.52	346.73
1986	May	350.35	347.23	348.08	346.49
1986	Apr	349.57	347.01	347.98	346.34
1986	Mar	347.88	346.53	347.46	346.13
1986	Feb	346.95	346.36	347.08	346.09
1986	Jan	346.42	346.43	346.86	346.21
1985	Dec	345.61	346.52	346.30	346.05
1985	Nov	344.22	346.35	345.55	345.89
1985	Oct	342.92	346.24	344.42	345.81
1985	Sep	343.04	346.24	343.16	345.61
1985	Aug	344.70	346.19	343.22	345.49
1985	Jul	346.49	345.80	344.71	345.43
1985	Jun	348.19	345.71	346.01	345.13
1985	May	348.75	345.56	346.51	344.90
1985	Apr	348.02	345.40	346.69	345.09