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 09/17/2026 , at 02:15 AM CST )
|
Time (CST) |
Little Rock, Doyle Springs Road | Marion | PARR | Springdale |
| 1 AM | 18.9 | 18.9 | ||
| 2 AM | 18.7 |
Yesterday's Data
( 09/16/2026 )
|
Time (CST) |
Little Rock, Doyle Springs Road | Marion | PARR | Springdale |
| 1 AM | 10.6 | 17.3 | 15.7 | 11.1 |
| 2 AM | 13.1 | 14.5 | 15.3 | 10.5 |
| 3 AM | 16.9 | 14.9 | 15.0 | 11.9 |
| 4 AM | 15.7 | 15.0 | 17.0 | 13.1 |
| 5 AM | 16.6 | 16.2 | 18.8 | 15.3 |
| 6 AM | 21.5 | 17.4 | 22.3 | 16.4 |
| 7 AM | 25.9 | 18.2 | 20.1 | 17.5 |
| 8 AM | 26.8 | 17.9 | 22.4 | 18.3 |
| 9 AM | 16.1 | 15.9 | 28.6 | 16.2 |
| 10 AM | 4.5 | 16.9 | 32.1 | 13.1 |
| 11 AM | 2.7 | 14.3 | 25.1 | 9.0 |
| 12 Noon | 23.0 | 13.8 | 17.5 | 7.0 |
| 1 PM | 11.6 | 11.3 | 7.6 | |
| 2 PM | 1.0 | 8.7 | 10.3 | 8.8 |
| 3 PM | 22.8 | 8.7 | 10.9 | 10.1 |
| 4 PM | 17.8 | 9.8 | 13.2 | 8.4 |
| 5 PM | 23.1 | 11.6 | 15.0 | 7.8 |
| 6 PM | 19.2 | 18.9 | 8.8 | |
| 7 PM | 15.8 | 25.6 | 12.6 | |
| 8 PM | 12.5 | 46.0 | 14.6 | |
| 9 PM | 12.3 | 0.0 | 36.9 | 14.2 |
| 10 PM | 13.1 | 16.1 | 32.2 | 13.1 |
| 11 PM | 13.5 | 16.7 | 27.4 | 11.4 |
| 12 Midnight | 14.2 | 17.3 | 33.7 | 11.7 |
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 - 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 | |