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Michigan stationary (point) source emission trends

Michigan stationary (point) source emission trends

Since 1974, approximately 2000 industrial facilities in Michigan have been required to report annual emissions of air pollutants. Specifically, criteria pollutants, which includes carbon monoxide (CO), lead, oxides of nitrogen (NOx), particulate matter less than 10 microns in diameter (PM10), sulfur dioxide (SO2), and volatile organic compounds (VOCs). Maintaining an annual inventory is required by the Clean Air Act.

Emissions data is used for a variety of things in Michigan and is also reported to the United States Environmental Protection Agency for use in the national Air Emissions Inventory.

This webpage contains information on pollutant trends over time. This data is updated on an annual basis. 

 
Graph of Michigan Stationary (Point) Source Emission Trends 1974-2024

Overall emissions trends over time

This graph shows an overall decrease in criteria pollutant emissions over time. All pollutants have shown significant decreases since 1974. This can be attributed to air quality rules and regulations designed to restrict and reduce emissions as well as improvements in technology.

Things to keep in mind when reviewing the following chart:

  • Estimating methodologies, emission factors, and data availability can vary year to year.
  • Caution should be exercised when evaluating trends in emission estimations and should only be interpreted in a qualitative manner.
  • The criteria emissions estimate data presented here represents the data reported from the facilities and is subject to limited quality assurance efforts by EGLE to identify, verify, and correct outlier data.
Expand the graph

Individual pollutant reductions over time

The graphs included here show each criteria pollutant along with their percentage reductions since 2000. Charts show emissions through 2024.

Things to keep in mind when reviewing the pollutant charts.

  • Estimating methodologies, emission factors, and data availability can vary year to year. Caution should be exercised when evaluating trends in emission estimations and should only be interpreted in a qualitative manner.
  • The criteria emissions estimate data presented here represents the data reported from the facilities and is subject to limited quality assurance efforts by EGLE to identify, verify, and correct outlier data.
  • 2020 shows a temporary emissions decline in response to COVID-19 shutdowns.

Graphs of individual pollutants