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 07/13/2025 , at 01:15 AM CST )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 5.8

Yesterday's Data

( 07/12/2025 )

Time
(CST)
Little Rock,
Doyle Springs
Road
MarionPARRSpringdale
1 AM 14.814.716.013.8
2 AM 13.112.615.513.5
3 AM 12.713.414.912.1
4 AM 16.016.114.211.4
5 AM 13.019.113.810.9
6 AM 13.522.112.911.4
7 AM 15.324.511.611.0
8 AM 15.925.210.615.3
9 AM 11.624.89.62.6
10 AM 13.020.49.76.0
11 AM 3.215.810.49.1
12 Noon 1.315.210.36.8
1 PM 13.99.61.5
2 PM 13.411.49.04.4
3 PM 9.110.78.27.2
4 PM 10.811.58.67.6
5 PM 6.916.57.68.7
6 PM 7.615.95.16.9
7 PM 9.515.35.79.1
8 PM 10.03.46.57.4
9 PM 13.68.06.57.4
10 PM 8.99.86.95.5
11 PM 11.26.95.8
12 Midnight2.86.2

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