Since the passage of the smoke ordinance in St. Louis City in 1937 Missouri has been working to improve air quality over the decades. Today, most areas of Missouri meet the federal Ambient Air Quality Standards with the exception of the ozone standard in some areas of the St. Louis metropolitan area and a few other localized areas for lead and sulfur dioxide.

The state develops a plan to address emissions that contribute to poor air quality when an area does not meet air quality standards. The long-term trends in emissions and air pollutants continue to decrease thanks to planning efforts as well as support from industry and citizens to reduce emissions.

Tracking the amount of pollutant emissions by regulated facilities is one way Missouri monitors improvements in air quality. The following charts track some emissions reported by large point sources such as power plants and industrial sources.

Point Sources Emissions Reported by Regulated Facilities

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Point Sources CO Emissions graph
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Point Sources Lead Emissions graph
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Point Sources NOX Emissions graph
 
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Point Sources PM10 Emissions graph
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Point Sources SO2 Emissions graph
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Point Sources VOC Emissions graph
 

Emissions from power plants and industrial sources are only part of the story. Another category of the emissions inventory includes mobile sources such as cars and trucks and nonpoint sources like residential and light commercial fuel combustion. In urban areas, the total emissions from the mobile sources is greater than point sources for some pollutants. Additional emissions reduction strategies for these areas may become necessary.

The following charts group the total statewide emissions inventory into the various emissions categories. This inventory is called the national emissions inventory and is produced on a three year cycle due to the effort needed to compile the emissions data estimates from all source categories.

National Emissions Inventory from All Sources

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National Emissions Inventory Ammonia graph
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National Emissions Inventory CO graph
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National Emissions Inventory Lead graph
 
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National Emissions Inventory NOX graph
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National Emissions Inventory PM10 graph
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National Emissions Inventory PM2.5 graph
 
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National Emissions Inventory SO2 graph
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National Emissions Inventory VOC graph