January 23, 2019
LOUISVILLE TOXIC AIR CONTAMINANTS MONITORING UPDATE
POSTED BYPatricia A. Mason, P.E.
Mr. Billy DeWitt, Air Monitoring Program Manager, at Louisville Metro Air Pollution Control District (APCD) presented an update on recent progress related to toxic air contaminants (TACs) monitoring and the recommissioning of an automated-gas chromatograph system (Auto-GC) during the January 16th, 2019, APCD Board meeting. The presentation can be downloaded at this link. The January presentation was a follow-up to the Air Toxics Auto-GC Update presentation in November, 2018.
The first APCD ambient air monitoring station to be outfitted with an Auto‑GC is the Louisville Police Firearms Training site located at 4201 Algonquin Parkway. The Auto‑GC was initially installed in September 2017 and was reinstalled after system upgrades in December 2018. The Auto‑GC is providing APCD with near real-time volatile organic compound (VOC) concentrations at the Louisville Police Firearms Training site. Seventeen (17) VOCs (Primarily Category 1 TACs) are currently monitored; APCD plans to monitor additional VOCs in the future.
Operation and calibration of an Auto‑GC unit is very complicated work. Standard operating procedures are being vetted; improvements to calibration systems/procedures are pending; and APCD is actively working to address data quality concerns. System upgrades, including a longer GC column, are planned to address issues related to temperature control, humidity, and coelution.
Future plans include a second Auto-GC unit for installation at the Cannons Lane Photochemical Assessment Monitoring Stations (PAMS) site. Additionally, APCD plans to report near real‑time data of the Auto-GC results to the Louisville Air Watch website. Preliminary 1,3-butadiene monthly average concentrations and monthly maximum concentrations summaries were presented for the Louisville Police Firearms Training monitoring site between November 2017 and September 2018. Successful operation of the Auto-GC units will greatly expand the ambient air quality data available for monitored areas and will potentially provide critical information in the event of an emergency release in or near monitored areas. Visit the APCD Air Toxics Monitoring Program website to check for updated information.
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