AQI - Little Rock Metropolitan Area
DEQ takes continuous readings at various locations throughout Arkansas. The pollutants that are monitored include five major atmospheric pollutants: carbon monoxide (CO), nitrogen dioxide (NO2), ozone (O3), sulfur dioxide (SO2), and particulates (PM10 and PM2.5). The index is based upon the highest contributing pollutant. For example, if ozone is highest, then the value for ozone determines the index. The numbers that are retrieved from the readings are then converted to the Air Quality Index (AQI), which allows pollutant levels to be compared to their health standards and to be assigned a rating of good, moderate, or unhealthy.
AQI - Little Rock Metropolitan Area
Most Recent Observed Maximum Value
(24 Hour Period Beginning at 6:00 am CST 04/22/2024)
| Critical Pollutant | AQI | Air Quality | Condition |
|---|---|---|---|
| Ozone | 47 | Good | Green |
| (Air quality is considered satisfactory, and air pollution poses little or no risk.) | |||
Details of Most Recent Observed Maximum Value
| Pollutant | Concentration | AQI | Air Quality | Condition |
|---|---|---|---|---|
| Ozone | 0.051 | 47 | Good | Green |
| Fine Particulate | 7.6 | 32 | Good | Green |
| (Air quality is considered satisfactory, and air pollution poses little or no risk.) | ||||
Forecast for Today
(24 Hour Period Beginning at 6:00 am CST 04/23/2024)
| Pollutant | Concentration | AQI | Air Quality | Condition |
|---|---|---|---|---|
| Ozone | 0.056 | 55 | Moderate | Yellow |
| Fine Particulate | 8.3 | 35 | Good | Green |
| (Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.) | ||||
Forecast for Tomorrow
(24 Hour Period Beginning at 6:00am CST 04/24/2024)
| Pollutant | Concentration | AQI | Air Quality | Condition |
|---|---|---|---|---|
| Ozone | 0.043 | 40 | Good | Green |
| Fine Particulate | 7.2 | 30 | Good | Green |
| (Air quality is considered satisfactory, and air pollution poses little or no risk.) | ||||
Recent AQI Data
(Data from the previous 90 days)
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) |
PM2.5 (24hr) (ug/m3) |
PM10 (24hr) (ug/m3) |
CO (8hr) (ppm) |
SO2 (24hr) (ppm) |
NO2 (24hr) (ppm) |
Air Quality |
Color |
|---|---|---|---|---|---|---|---|---|---|
| 0 - 50 | 0.000 - 0.054 | 0.000 - 0.084 | 0.0 - 12.0 | 0 - 54 | 0.0 - 4.4 | 0.000 - 0.034 | - | Good | Green |
| 51 - 100 | 0.055 - 0.070 | 0.085 - 0.124 | 12.1 - 35.4 | 55 - 154 | 4.5 - 9.4 | 0.035 - 0.144 | - | Moderate | Yellow |
| 100 - 150 | 0.071 - 0.085 | 0.125 - 0.164 | 35.5 - 55.4 | 155 - 254 | 9.5 - 12.4 | 0.145 - 0.224 | - | Unhealthy for Sensitive Groups |
Orange |
| 151 - 200 | 0.086 - 0.105 | 0.165 - 0.204 | 55.5 - 150.4 | 255 - 354 | 12.5 - 15.4 | 0.225 - 0.304 | - | Unhealthy | Red |
| 201 - 300 | 0.106 - 0.200 | 0.205 - 0.404 | 150.5 - 250.4 | 355 - 424 | 15.5 - 30.4 | 0.305 - 0.604 | 0.65 -1.24 | Very Unhealthy | Purple |
| 301 - 400 | 0.201 & above | 0.405 - 0.604 | 250.5 - 500.4 | 425 - 604 | 30.5 - 50.4 | 0.605 - 1.004 | 1.25 - 2.04 | Hazardous | Maroon |
Explanation of Pollutant Categories
| Pollutant | Sensitive Group |
|---|---|
| O3 = Ozone | Children and people with asthma |
| 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 |
| CO = Carbon Monoxide | People with respiratory or heart disease, the elderly and children |
| SO2 = Sulfur Dioxide | People with asthma |
| NO2 = Nitrogen Dioxide | |
|
ppm = parts per million (1 part pollutant in 1 million parts of air) ug/m3 = micrograms per cubic meter of air |
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