EtO Monitoring Results

Recent Updates

December 12, 2019 Update: Second set of Phase II air monitoring results received

The Lake County Health Department has received the second set of Phase II air monitoring results from samples collected on five separate days from November 4 to November 17, 2019. The Air Monitoring Results spreadsheet will continue to be updated as additional results are received.

November 26, 2019 Update: First set of Phase II air monitoring results received

The Lake County Health Department has received the first set of results from the second phase of ethylene oxide (EtO) air monitoring. The initial results include samples collected on three separate days from October 26 to November 2, 2019. This phase of the air monitoring is set to continue through January 2020 and is being funded by the Illinois Environmental Protection Agency. 

To make the results more user-friendly, the Health Department is now linking to an online spreadsheet rather than embedding a table on this page. The Air Monitoring Results spreadsheet will be updated as additional results are received.

PRESS RELEASE: Ethylene Oxide Air Monitoring Results Received

Lake County Air Monitoring Results

Air samples collected by GHD Services, Inc. are sent to a laboratory for analysis. Once received, the results are shared with partner agencies then posted publicly on this page. The results indicate the levels of EtO in the air at the monitoring locations. These reported levels do not indicate your health or cancer risks. Learn more on our EtO Monitoring Frequently Asked Questions (FAQ) page.

Air Monitoring Results Spreadsheet

Updated December 12, 2019

Previous Updates

August 14, 2019 Update: [Phase 1] final air monitoring results received; corrections to wind rose diagrams

The final air monitoring results from phase 1 are posted below. Please note that all maps have been revised to include adjusted wind rose diagrams that provide a more detailed gradient for wind speed, more distinctive coloring to better distinguish wind speeds, and corrected wind speed data. 

PRESS RELEASE: Final Ethylene Oxide Air Monitoring Results Received

July 24, 2019 Update: Additional air monitoring results received

Both Medline and Vantage conducted independent air monitoring in June 2019, some of which were done at sites also being monitored by the Health Department, the Village of Gurnee and the City of Waukegan. Results can be viewed here:

Medline air monitoring results

Vantage air monitoring results

Lake County Air Monitoring Wind Rose Maps

The maps posted below show the monitoring locations, air monitoring results by day, and a wind rose, which shows the wind information for each sampling day (i.e., wind direction, intensity, and percentage of time wind was blowing from the direction indicated). 

Wind roses are very important in determining the potential impact of a source of pollution. For more information, please see the U.S. EPA’s How to Read a Wind Rose (PDF).

  1. October 2019-January 2020 Monitoring
  2. June-July 2019 Monitoring

Lake County Air Monitoring Lab Reports

  1. October 2019-January 2020 Monitoring
  2. June-July 2019 Monitoring