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 02/09/2025 , at 02:15 AM CST )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 6.55.24.57.2
2 AM 5.77.55.47.9

Yesterday's Data

( 02/08/2025 )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 5.012.35.58.9
2 AM 4.810.36.08.9
3 AM 5.711.86.79.3
4 AM 6.99.17.212.5
5 AM 8.815.37.616.0
6 AM 8.322.66.915.9
7 AM 10.316.57.016.4
8 AM 9.917.07.919.3
9 AM 10.414.410.018.9
10 AM 11.714.310.619.1
11 AM 11.716.011.418.8
12 Noon 15.112.913.19.1
1 PM 14.111.514.15.4
2 PM 14.513.614.85.0
3 PM 16.114.214.55.2
4 PM 16.714.814.25.2
5 PM 18.616.914.45.4
6 PM 23.912.415.97.5
7 PM 19.111.012.48.6
8 PM 13.05.87.27.5
9 PM 9.66.65.77.6
10 PM 8.23.811.37.2
11 PM 6.83.38.77.5
12 Midnight6.73.34.67.7

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 - 12.0 0 - 54 Good Green
51 - 100 12.1 - 35.4 55 - 154 Moderate Yellow
100 - 150 35.5 - 55.4 155 - 254 Unhealthy for
Sensitive Groups
Orange
151 - 200 55.5 - 150.4 255 - 354 Unhealthy Red
201 - 300 150.5 - 250.4 355 - 424 Very Unhealthy Purple
301 - 400 250.5 - 500.4 425 - 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