AQI - Little Rock Metropolitan Area

ADEQ 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 - "good", "moderate", or "unhealthy."

AQI - Little Rock Metropolitan Area

Current Condition

(24 Hour Period Ending at 5:00 am CST 8/27/2015)

Critical Pollutant AQI Air Quality Condition
Fine Particulate  41  Good  Green
(No health impacts are expected in this range.)

Details of Current Condition

Pollutant Concentration AQI Air Quality Condition
Ozone 0.044 37 Good  
Fine Particulate 9.8 41 Good Green
(No health impacts are expected in this range.)

Forecast for Today

(5:00 am CST 8/27/2015 to 5:00 am CST 8/28/2015)

Pollutant Concentration AQI Air Quality Condition
Ozone 0.052 44 Good/Moderate Green
Fine Particulate 6 25 Good  
(No health impacts are expected in this range.)

Forecast for Tomorrow

(5:00am CST 8/28/2015 to 5:00am CST 8/29/2015)

Pollutant Concentration AQI Air Quality Condition
Ozone  0.053 45 Good/Moderate Green
Fine Particulate 6.8 25 Good  
(No health impacts are expected in this range.)

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 - 0.059 0.000 - 0.084 0.0 - 12.0 0 - 54 0.0 - 4.4 0.000 - 0.034 - Good Green
51 - 100 0.060 - 0.075 0.085 - 0.124 12.1 - 35.4 55 - 154 4.5 - 9.4 0.035 - 0.144 - Moderate Yellow
100 - 150 0.076 - 0.095 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 0.096 - 0.115 0.165 - 0.204 55.5 - 150.4 255 - 354 12.5 - 15.4 0.225 - 0.304 - Unhealthy Red
201 - 300 0.116 - 0.374 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 0.375 & 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