To calculate the AQI, subtract the lower concentration (C_{low}) from the measured concentration (C), multiply this result by the ratio of the difference between the upper and lower AQI values and the difference between the upper and lower concentration values. Then, add the lower AQI value (I_{low}) to the result.
The Air Quality Index (AQI) Calculator is a crucial tool used to assess air quality levels in a given area. By measuring pollutants like PM2.5, PM10, carbon monoxide, and others, the calculator determines the air quality index, which indicates whether the air is healthy or hazardous.
The AQI is widely used to communicate air quality in real time, helping people make informed decisions about outdoor activities.
This tool uses the AQI calculation formula to convert pollutant concentrations into a standardized index. The calculator is ideal for tracking air quality at home or using data from national sources.
Formula:
| Variable | Meaning |
|---|---|
| AQI | Air Quality Index |
| I_{high} | Upper AQI value for the concentration range |
| I_{low} | Lower AQI value for the concentration range |
| C_{high} | Upper concentration value for the pollutant |
| C_{low} | Lower concentration value for the pollutant |
| C | Actual measured concentration of the pollutant |
Solved Calculations :
Example 1:
Given Values:
- I_{high} = 100
- I_{low} = 50
- C_{high} = 150 µg/m³
- C_{low} = 50 µg/m³
- C = 75 µg/m³
| Calculation | Instructions |
|---|---|
| AQI = × (75 – 50) + 50 | Subtract the values for the concentration and AQI ranges. |
| AQI = (50 / 100) × 25 + 50 | Perform the division and multiplication. |
| AQI = 0.5 × 25 + 50 | Simplify the equation. |
| AQI = 12.5 + 50 | Perform the addition. |
| AQI = 62.5 | The result gives the AQI value. |
Answer: AQI = 62.5
Example 2:
Given Values:
- I_{high} = 200
- I_{low} = 150
- C_{high} = 200 µg/m³
- C_{low} = 100 µg/m³
- C = 180 µg/m³
| Calculation | Instructions |
|---|---|
| AQI = × (180 – 100) + 150 | Subtract the values for the concentration and AQI ranges. |
| AQI = (50 / 100) × 80 + 150 | Perform the division and multiplication. |
| AQI = 0.5 × 80 + 150 | Simplify the equation. |
| AQI = 40 + 150 | Perform the addition. |
| AQI = 190 | The result gives the AQI value. |
Answer: AQI = 190
What is Air Quality Index Calculator ?
The Air Quality Index (AQI) is calculated using concentrations of key air pollutants, including PM2.5, PM10, ozone, carbon monoxide (CO), nitrogen dioxide (NO2), and sulfur dioxide (SO2). Each pollutant is assigned a value on the AQI scale, which ranges from 0 to 500, with lower values indicating good air quality and higher values signaling hazardous conditions.
The AQI calculation formula involves measuring pollutant levels and applying specific calculations to determine the index. For example, the concentration of PM2.5 can be converted to an AQI using the PM2.5 to AQI formula, giving a clear picture of air quality. The Air Quality Index Calculator allows users to input pollutant levels and receive an instant AQI rating.
The AQI is categorized into ranges, from “Good” (0-50) to “Hazardous” (301-500), with each range representing a different level of health concern.
This calculator helps users understand whether outdoor activities are safe based on the air quality. It is also useful for those interested in tracking air quality by location, as it can be used in conjunction with sources like zip codes or national databases.
For detailed assessments, the calculator provides AQI data in easy-to-read formats, including charts and tables, making it a valuable tool for anyone concerned about air quality or pollution levels in their area.
