Air Quality Index Calculator


Calculating the Air Quality Index (AQI) is essential for understanding the level of pollution in a specific area. This article provides a detailed guide on how to use an AQI calculator to determine the air quality based on various pollutants.

How to Use

To use the AQI calculator, follow these steps:

  1. Enter the concentration levels of pollutants such as particulate matter (PM2.5 and PM10), sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3) in the respective input fields.
  2. Click the "Calculate" button to obtain the AQI value.
  3. The result will display the calculated AQI along with the corresponding air quality category.


The AQI is calculated using the formula specified by environmental agencies like the United States Environmental Protection Agency (EPA). The formula involves converting the concentration levels of different pollutants into a standardized index. The highest index value among the pollutants is then considered as the AQI value.

Example Solve

Suppose we have the following concentration levels:

  • PM2.5: 35 µg/m³
  • PM10: 50 µg/m³
  • SO2: 20 ppb
  • NO2: 30 ppb
  • CO: 3 ppm
  • O3: 60 ppb

Entering these values into the calculator and clicking "Calculate" yields an AQI of 91, indicating moderate air quality.


What is the significance of the AQI categories?

The AQI categories provide information on the health effects associated with different levels of air pollution. They range from "Good" to "Hazardous," indicating the corresponding health risks.

How often should AQI be monitored?

AQI should be monitored regularly, especially in areas prone to high pollution levels or during environmental events such as wildfires or industrial accidents.

Can AQI values vary throughout the day?

Yes, AQI values can vary based on factors such as traffic density, industrial activities, weather conditions, and geographical features.


In conclusion, the AQI calculator is a valuable tool for assessing air quality and understanding its impact on health. By monitoring AQI levels, individuals and authorities can take appropriate measures to mitigate the effects of air pollution and protect public health.

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