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Texas Photochemical Modeling Results—Interactive Scatter Plot

Interactive chart comparing results of the TCEQ’s air quality modeling and surface observations.

This interactive chart shows scatter plots of pollutant concentrations from the TCEQ's 2012 photochemical modeling comparing modeled values with available surface observations at locations of air quality monitoring sites in Texas. If you have any questions regarding this interactive chart, please send an email to with the subject "Texas Photochemical Modeling Results - Interactive Scatter Plot".

show instructions
invert hour range info
select an episode (loads new page)
select a run release version of chosen episode
choose a chemical species
choose hourly or eight-hour value
choose cell or bi-linear interpolated value
toggle overlay of Q-Q plot
choose date and hour range, or daily max values; click "redraw" button to update chart
save chart image or data series
hold the left mouse button and select a rectangle in the chart area to zoom in
hover the cursor over a data point to show the data values and corresponding date and time
move the cursor over upper half y-axis label area or right half x-axis label area, hold the left mouse button and move up/down or right/left to change the upper range value, double click to set it to the default value;

similarly, change the lower range value over the bottom half y-axis label area or left half x-axis label area; the lower range value cannot be changed below zero;

value ranges of y-axis and x-axis are synced
choose a site from this drop-down list or ...
... choose a site by clicking on a site marker on this map
the selected site is shown as a green marker
check to show modeling domain outlines on the map
check to zoom and center the map on the selected site