Particulate Matter Monitor Stations - Arkansas

These readings represent 1hr average PM2.5 (ug/m3), as reported directly from the particulate matter monitoring stations maintained by DEQ throughout the state. Automated readings are processed hourly throughout the day, starting at approx. 1 am through midnight central standard time.

NOTE: This information is "raw data" as automatically collected and reported by the monitoring stations and has not been quality control checked, analyzed, or verified.

Particulate Matter Monitor Stations - Arkansas Hourly Readings

Current Data

( Last Updated 08/02/2025 , at 4:15 PM CST )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 9.316.99.114.9
2 AM 8.811.59.118.7
3 AM 7.612.48.722.1
4 AM 10.515.610.222.2
5 AM 14.718.413.823.5
6 AM 15.721.116.823.8
7 AM 19.721.620.824.9
8 AM 19.620.422.427.1
9 AM 20.021.423.927.6
10 AM 20.221.823.926.2
11 AM 19.620.823.023.1
12 Noon 16.219.021.821.5
1 PM 15.616.620.021.0
2 PM 15.012.617.622.4
3 PM 16.412.918.2
4 PM 17.9

Yesterday's Data

( 08/01/2025 )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 4.75.07.03.6
2 AM 6.03.16.03.4
3 AM 5.26.45.34.7
4 AM 6.76.64.48.8
5 AM 7.07.66.114.3
6 AM 6.78.29.417.7
7 AM 7.99.18.020.8
8 AM 8.410.27.924.1
9 AM 9.810.28.722.9
10 AM 9.910.99.524.2
11 AM 9.311.59.725.1
12 Noon 9.210.610.223.2
1 PM 9.311.59.224.7
2 PM 10.77.49.727.4
3 PM 9.58.010.126.9
4 PM 10.311.310.919.5
5 PM 9.612.49.721.6
6 PM 8.910.89.223.6
7 PM 7.913.68.318.9
8 PM 6.914.68.821.6
9 PM 8.015.26.919.3
10 PM 6.815.67.816.3
11 PM 7.914.58.115.9
12 Midnight8.614.39.116.1

AQI Numbers

The range for the AQI is 0-500 and is related to air quality as follows:

Index
Values
PM2.5
(24hr)
(ug/m3)
PM10
(24hr)
(ug/m3)
Air
Quality
Colors
0 - 50 0.0 - 9.0 0 - 54 Good Green
51 - 100 9.1 - 35.4 55 - 154 Moderate Yellow
100 - 150 35.5 - 55.4 155 - 254 Unhealthy for
Sensitive Groups
Orange
151 - 200 55.5 - 125.4 255 - 354 Unhealthy Red
201 - 300 125.5 - 225.4 355 - 424 Very Unhealthy Purple
301 - 400 225.5+ 425 - 604 Hazardous Maroon

Explanation of Pollutant Categories

Pollutant Sensitive Group
PM10 = Particulate Matter < 10 microns People with respiratory or heart disease, the elderly and children
PM2.5 = Particulate Matter < 2.5 microns People with respiratory or heart disease, the elderly and children
ug/m3 = micrograms per cubic meter of air