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All TCEQ applications, including LEADS, will be unavailable Saturday, October 3 and Sunday, October 4 for a scheduled power outage by the Texas Facilities Commission. All TCEQ applications should be back online by Monday, October 5, 2015. Please check back for further updates.

Parameters Measured


Visibility is measured in miles (visibility).

Visibility is a measure of how far the human eye can see through the atmosphere in the absence of obstructions such as nearby buildings and trees. Visibility is not measured directly but is derived from a measured extinction coefficient.