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Carbon Monoxide Hourly Averages

Carbon monoxide is a colorless, odorless, very toxic gas produced by the incomplete combustion of carbon-containing fuels, most notably by gasoline powered engines, power plants, and wood fires.

The eight-hour standard can be exceeded during winter months when very stable atmospheric conditions exist.

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Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
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Carbon Monoxide Hourly Averages for Monday, September 20, 2021.
measured in parts per million
Mid 1:00 2:00 3:00 4:00 5:00
East Central - all times are in EST
42 0.2340.2410.2360.2190.226 FEW 42 1 R IDEM
78 0.2420.2500.2540.2540.252 FEW 78 1 R IDEM
Mid 1:00 2:00 3:00 4:00 5:00
South West - all times are in CST
46 -0.159-0.180-0.190-0.181 FEW NA 46 1 R IDEM
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the IDEM and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from IDEM ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.