This directory contains the observed data from Texas CAMS monitoring sites:

* 2006
 ** aq.data.cams.tx.2006.2013OCT01.tgz  - 2006 hourly air quality data (posted on 10/01/2013)
 ** met.data.cams.tx.2006.2013OTC01.tgz - 2006 hourly meteorological data (posted on 10/01/2013)
 ** o3_dvb_by_site.2006.2011JUL20.xlsx  - 2006 baseline ozone design values (posted on 07/20/2011)

* 2012
 ** aq.data.cams.tx.2012.2016JUN27.tgz  - 2012 hourly air quality data (updated on 06/27/2016)
 ** met.data.cams.tx.2012.2016JUN27.tgz - 2012 hourly meteorological data (updated on 06/27/2016)
 ** o3_dvb_by_site.2012.2015FEB27.xlsx  - 2012 baseline ozone design values (posted on 02/27/2015)


Notes on hourly observed data:

* All data are in the Central Standard Time zone (CST).

1. File name convention

   VARNAME.data.SOURCE.BEGDATE_ENDDATE[.CHEM]

   where VARNAME - chemical species name: o3, no, no2, nox, co, isop, ole, eth ...
                   meteorological variables:
                      wind - wind direction and speed
                      temp - air temperature
                      dewp - dew point temperature
                      pres - air pressure
                      hum  - specific humidity
                      rhum - relative humidity
                      pbl  - estiamted mixing height
         BEGDATE - beginning date of data (e.g. 20060501)
         ENDDATE - ending date of data (e.g. 20060731)
         SOURCE  - data source, e.g. cams.tx (CAMS sites in Texas)
         CHEM    - chemical species, CB6 for VOC data from auto-GC sites


2. File format of hourly osberved data

   (1) Header

     * Line 1:

         #_OF_SITE MAP_PROJECTION [MAP_PROJECTION_PARAMETERS]

         where #_OF_SITE is the number of sites in the file;
               MAP_PROJECTION is the map projection type such as LATLON, LAMBERT, UTM;
               [MAP_PROJECTION_PARAMETER] is optional map projection parameters:
                 LATLON - no paramters
                 UTM - utm ozone number
                 LAMBERT - two true latitudes and center lat/lon coordinates
         Values are separated by a space.

     * Lines 2 - #_OF_SITE+1:  
                         
         SITE_CODE X Y Z SITE_INFO

         where SITE_CODE is a four-letter code name used in modeling;
               X, Y are the site's coordinates in kilometer
               Z is the site's elevation in meter
               SITE_INFO is information of a site including EPA site code number, CAMS site number, site name, street address, etc
       

   (2) Data Body

     DATE SITE_CODE VARNAME UNIT 24_HOUR_DATA

     where DATE is a date in the format of YYYYMMDD (e.g. 20060601 - June 1, 2006)
           SITE_CODE is four-letter site code used in modeling
           VARNAME - variable name: O3, NO, NO2 NOX, CO, TEMP, HUM, etc
           UNIT - value unit, PPB
           24_HOUR_DATA - 24 hourly data values

     Format in FORTRAN: (A8,1X,A4,1X,A4,1X,A4,1X,24f7)


3. Missing Data
   
   A missing value is denoted by -999.0.