Ozone Monitor Stations - Arkansas

These readings represent one hour (1 hr) average ozone parts per million (ppm), as reported directly from the six ozone monitoring stations maintained by DEQ throughout the state. Automated readings are processed hourly throughout the day, starting at approximately 2 am through midnight central standard time (CST).

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.

Ozone Monitor Stations - Arkansas Hourly Readings

Current Data

( Last Updated 05/21/2025 , at 04:15 AM CST )

Time (CST)	Eagle Mountain	Fayetteville	Marion	N Little Rock Airport	N Little Rock, Pike Ave & River Rd	Springdale
2 AM	0.044	0.004	0.030	0.027	0.030	0.005
3 AM	0.044	0.007	0.027
4 AM

Yesterday's Data

( 05/20/2025 )

Time (CST)	Deer	Eagle Mountain	Fayetteville	Marion	N Little Rock Airport	N Little Rock, Pike Ave & River Rd	Springdale
2 AM	0.044	0.048		0.020	0.048	0.050	0.045
3 AM	0.044	0.050		0.048	0.046	0.049	0.050
4 AM	0.041	0.046		0.042	0.045	0.047	0.045
5 AM	0.044	0.041		0.041	0.041	0.043	0.038
6 AM	0.041	0.034		0.039	0.036	0.039	0.040
7 AM	0.039	0.027		0.037	0.037	0.038	0.035
8 AM	0.038	0.026		0.033	0.036	0.035	0.033
9 AM	0.033	0.022	0.013	0.041	0.029	0.030	0.034
10 AM	0.032	0.023	0.033	0.041	0.021	0.024	0.034
11 AM	0.036	0.027	0.037	0.034	0.018	0.024	0.039
12 Noon	0.042	0.038	0.050	0.028	0.024	0.029	0.054
1 PM	0.043	0.046	0.049	0.025	0.024	0.034	0.047
2 PM	0.047	0.046	0.042	0.026	0.027	0.046	0.039
3 PM	0.047	0.041	0.037	0.029	0.032	0.043	0.038
4 PM	0.045	0.038	0.037	0.041	0.039	0.049	0.037
5 PM	0.039	0.039	0.040	0.037	0.042	0.056	0.039
6 PM	0.037	0.037	0.040	0.037	0.040	0.051	0.041
7 PM	0.040	0.036	0.038	0.037	0.037	0.050	0.039
8 PM	0.040	0.038	0.023	0.042	0.034	0.047	0.033
9 PM	0.039	0.040	0.018	0.047	0.033	0.045	0.023
10 PM	0.038	0.042	0.015	0.044	0.031	0.038	0.009
11 PM	0.038	0.043	0.011	0.041	0.031	0.030	0.005
12 Midnight	0.038	0.044	0.009	0.035	0.030	0.032	0.015

AQI Numbers

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

Index Values	O₃ (8hr) (ppm)	O₃ (1hr) (ppm)	Air Quality	Colors
0 - 50	0.000 - 0.054	0.000 - 0.084	Good	Green
51 - 100	0.055 - 0.070	0.085 - 0.124	Moderate	Yellow
100 - 150	0.071 - 0.085	0.125 - 0.164	Unhealthy for Sensitive Groups	Orange
151 - 200	0.086 - 0.105	0.165 - 0.204	Unhealthy	Red
201 - 300	0.106 - 0.200	0.205 - 0.404	Very Unhealthy	Purple
301 - 400	0.201 & above	0.405 - 0.604	Hazardous	Maroon

Explanation of Pollutant Categories

Pollutant	Sensitive Group
O₃ = Ozone	Children and people with asthma
ppm = parts per million (1 part pollutant in 1 million parts of air)