This dataset contains the MANITOU2011 campaign data collected by NSF NCAR Atmospheric Chemistry Observations & Modeling (ACOM) for the Manitou Experimental Forest Observatory (MEFO) between 2008 and 2016. The complete Manitou data archive contains data in a variety of formats (e.g., ASCII, ICARTT, JPEG) from the following field campaigns: Manitou2008, Manitou2009, Manitou2011, Manitou2014, Manitou2015, Manitou2016, SPIFFY2015, SPIFFY2016, Beachon-SRM (2008), 2010 Beachon ROCS, 2011 Beachon-RoMBAS, and 2015 Rx Burn. No data was collected for the 2016 CSU Cont. project. This dataset contains the data from the MANITOU2011 campaign. The data are from the Manitou Experimental Forest Observatory (MEFO) that was established in 2008, in an area representative of a middle-elevation (~2000-2500 m ASL). It is a semi-arid, ponderosa pine ecosystem that is common throughout the Rocky Mountain West. The station location is at 39.1006 degrees North, 105.0942 degrees West and at an elevation of 7700 feet ASL (2347 m). The chemistry tower at MEFO is a walk up type with height of 28m and there were 4 mobile laboratories with 160 Ft2 (14.9m2) space. A variety of data (e.g., meteorological, trace gases, Flux, CIMS) is contained in the Manitou data archive and it varies by year and campaign. See the dataset readme files for more information on all data collected. Learn more on the MANITOU project page at eol.ucar.edu/manitou.