| Year | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
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Specification![]() |
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| Nitrogen oxides (NO and NO2) (NOx) |
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| Volatile, non-methane organic compounds (COV-NM) |
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| Sulphur oxides (SO2 and SO3, …) (SOx) |
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| Ammonia (NH3) |
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| Patriculate matter (PM2.5) |
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| Particulate matter (PM10) |
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| Total Suspended Particulates (TSP) |
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| Carbon monoxide (CO) |
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| Carbon dioxide (CO2) |
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| Methane (CH4) |
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| Nitrous oxide (N2O) |
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Hydrofluorocarbons (HFCs) ![]() |
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Perfluorocarbons (PFCs) ![]() |
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Sulfur hexafluoride (SF6) ![]() |
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