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 03/18/2024 , at 10:15 PM CST )
Time (CST) |
Little Rock, Doyle Springs Road | Marion | PARR | Springdale |
1 AM | 9.5 | 5.3 | 2.9 | 4.7 |
2 AM | 7.4 | 6.3 | 6.0 | 3.8 |
3 AM | 5.7 | 5.1 | 7.8 | 4.9 |
4 AM | 6.4 | 5.2 | 4.5 | 5.8 |
5 AM | 6.0 | 6.8 | 3.6 | 5.7 |
6 AM | 6.3 | 3.0 | 3.1 | 6.8 |
7 AM | 4.8 | 5.4 | 3.0 | 6.7 |
8 AM | 2.4 | 4.5 | 2.9 | 5.0 |
9 AM | 3.8 | 3.7 | 3.0 | 4.5 |
10 AM | 3.9 | 5.3 | 3.1 | 4.6 |
11 AM | 4.3 | 4.5 | 3.4 | 4.0 |
12 Noon | 5.1 | 3.9 | 3.6 | 1.9 |
1 PM | 2.2 | 2.8 | 3.9 | 3.0 |
2 PM | 1.7 | 2.6 | 3.2 | 4.0 |
3 PM | 1.8 | 4.0 | 3.7 | 8.1 |
4 PM | 3.6 | 3.4 | 3.4 | 5.4 |
5 PM | 7.6 | 4.3 | 2.7 | 5.1 |
6 PM | 18.2 | 4.5 | 4.5 | 6.3 |
7 PM | 29.8 | 6.1 | 7.5 | 6.7 |
8 PM | 38.2 | 9.0 | 24.6 | 6.0 |
9 PM | 7.3 | 27.0 | ||
10 PM | 22.1 |
Yesterday's Data
( 03/17/2024 )
Time (CST) |
Little Rock, Doyle Springs Road | Marion | PARR | Springdale |
1 AM | 8.9 | 5.6 | 5.6 | 31.6 |
2 AM | 7.8 | 6.2 | 5.6 | 25.4 |
3 AM | 10.1 | 6.2 | 6.1 | 11.8 |
4 AM | 8.1 | 7.3 | 6.6 | 6.9 |
5 AM | 7.6 | 7.4 | 7.1 | 6.9 |
6 AM | 7.5 | 6.9 | 6.3 | 2.9 |
7 AM | 7.2 | 6.3 | 6.0 | 4.9 |
8 AM | 4.0 | 5.4 | 6.1 | 3.8 |
9 AM | 6.4 | 5.0 | 4.7 | 3.1 |
10 AM | 5.4 | 4.4 | 3.7 | 3.4 |
11 AM | 2.9 | 6.2 | 3.4 | 3.6 |
12 Noon | 1.5 | 3.0 | 1.7 | |
1 PM | 2.3 | 2.4 | 1.3 | |
2 PM | 3.3 | 3.1 | 2.3 | 1.1 |
3 PM | 3.9 | 2.8 | 2.5 | 1.5 |
4 PM | 3.5 | 2.4 | 2.9 | 5.1 |
5 PM | 5.5 | 4.8 | 2.7 | 5.1 |
6 PM | 11.1 | 5.5 | 2.6 | 8.6 |
7 PM | 14.3 | 7.7 | 2.8 | 9.4 |
8 PM | 10.9 | 12.0 | 3.2 | 8.3 |
9 PM | 4.6 | 10.2 | 3.4 | 7.6 |
10 PM | 4.5 | 7.5 | 1.9 | 7.2 |
11 PM | 6.3 | 8.4 | 2.1 | 3.8 |
12 Midnight | 5.5 | 7.4 | 2.3 | 3.9 |
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 |