Ozone Science

LADCO works to understand the causes of ground level ozone pollution in the Great Lakes region. This page provides the state of the science information on ozone chemistry, sources, and mitigation strategies.

Overarching question: How can the LADCO member states with ozone pollution issues most effectively address these issues?

Overall goal: Provide LADCO member states with the technical information needed to design cost-effective emissions control strategies to reduce ozone concentrations. This goal includes providing information about ozone precursor control measures, and the anticipated ozone impacts from implementation of those control measures.

Conceptual Models of Ozone Formation

In Summer 2022, Dr. Angie Dickens, the LADCO Data Scientist, expanded on the work by our Summer 2021 intern to develop a comprehensive report on ozone conceptual models for all of the recent ozone non-attainment areas in the region. The report combines information on meteorology and chemistry, emissions trends, and modeling to describe the mechanisms of ozone formation in each area of the region.

Technical Report: Conceptual Models of Ozone Formation in the LADCO Region

  • Read the technical report (coming Fall 2022)

In Summer 2021 the LADCO intern developed a library of ozone conceptual models for most of the areas in the Great Lakes region that are susceptible to high concentrations of ground-level ozone.

Visit the LADCO Ozone Conceptual Models Webpage

Ozone Chemistry

In late 2021/early 2022, Dr. Angie Dickens, the LADCO Data Scientist, conducted a meta-analysis of recent research on the current state of ground-level ozone formation chemistry in the Great Lakes region. She combined findings from field campaigns, observational studies, and modeling research with original analyses conducted at LADCO to provide the most comprehensive interpretation to date of the causes of and solutions to ozone pollution in this region.

Technical Report: Ozone Formation Sensitivity to NOx and VOC Emissions in the LADCO Region

Overview of the report: This report applies a suite of analytical tools to air quality data in the Great Lakes region to determine whether ozone formation in the region is most sensitive to NOx- or VOC-emissions changes. This study also examines how the ozone-NOx-VOC chemistry has changed over the past decades. This study applied five new analyses to these problems. The first three approaches involved the use of molecular ratios as indicators of the ozone formation chemistry, with certain ranges of ratio values indicating NOx-sensitive, transitional, or VOC-sensitive ozone chemistry. The second two approaches used patterns in ozone concentrations to infer the ozone formation chemistry. All analyses focused on the ozone formation chemistry on high-ozone days.

Ozone Trends

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