Boundary Layer Ozone Measurements            

This page last reviewed January 31, 2014

Each summer the Air Resources Board collects boundary layer ozone data in the Central Valley for use in the smoke management program.  The quantification of total column atmospheric ozone concentrations is important towards a number of aspect of smoke management, specifically how this variable changes in space and time during the burn hours.  The program uses two aircrafts, one in Fresno,  the other in Bakersfield to take measurement up to 7,500 ft each morning at 5 am PST.  Data measurement are collected from June 1st through September 30th. 

Instrumentation Descriptions

The 2B Technologies Ozone Monitor model 202 is designed to enable accurate measurements of atmospheric ozone over a wide dynamic range extending from a limit of detection of 1.5 parts-per-billion by volume (ppbv) to an upper limit of 100 parts-per-million (ppmv) based on the well established technique of absorption of ultraviolet light at 254 nm.  The Model 202 has been designated by the EPA as a Federal Equivalent Method (FEM): EQOA-0410-190.  As a designated FEM, the Model 202 Ozone Monitor may be used under 40 CFR Part 58, Ambient Air Quality Surveillance, for monitoring for compliance with the Clean Air Act 

Data Year:

Data Disclaimer

This data is provided by the California Air Resources Board and has not been subjected to normal quality control procedures, nor does it meet the criteria or standards of official California Air Resources Board data.  This data is released for limited public use as preliminary data and should be used only with the appropriate caution.  Statements and conclusions derived from the use of this data are those of the researcher and not necessarily those of the California Air Resources Board.

Data Validation Procedures

As mentioned, the routine monitoring, data collection, and data validation does not meet typical ARB standards.  However, a series of procedural steps to validate, edit, or delete the data collected has been done to remove spurious or incomplete data lines.  Additionally, each instrument is collected seasonally, calibrated and returned to operational use to ensure reliability.

Additional Information:

For more information please contact Dar Mims at (916) 322-7454.