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| | Excedencias a las normas de contaminantes atmosféricos | | (Número de días) | | | SO2 | CO | O3 | PM10 | NO2 | PM2.5 | | | | | | | | | | Mexicali | 1997 | 0 | 43 | 28 | - | 0 | - | | | 1998 | 0 | 76 | 27 | - | 2 | - | | | 1999 | 0 | 78 | 30 | - | 2 | - | | | 2000 | 0 | 53 | 14 | 59 | 0 | - | | | 2001 | 0 | 48 | 15 | 57 | 3 | - | | | 2002 | 0 | 46 | 8 | 45 | 1 | - | | | 2003 | 0 | 33 | 8 | 50 | 0 | 21 | | | 2004 | 0 | 17 | 5 | 60 | 0 | 64 | | | 2005 | 0 | 11 | 5 | 44 | 0 | 13 | | | 2006 | 0 | 7 | 4 | 49 | 0 | 63 | | | 2007 | 0 | 0 | 4 | 43 | 0 | 110 | | | 2008 | 0 | 0 | 3 | 47 | 0 | 73 | | | 2009 | - | - | - | 26 | - | - | | Tijuana | 1997 | 0 | 0 | 2 | - | 0 | - | | | 1998 | 0 | 0 | 1 | - | 1 | - | | | 1999 | 0 | 0 | 0 | - | 2 | - | | | 2000 | 0 | 0 | 0 | 4 | 1 | - | | | 2001 | 0 | 1 | 0 | 4 | 0 | - | | | 2002 | 0 | 1 | 0 | 6 | 0 | - |
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