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The Air Quality Index (AQI) is a tool used to communicate the level of air pollution to the public. It helps individuals and authorities understand pollution levels and take appropriate actions. Calculating the AQI involves measuring specific pollutants and converting these measurements into a standardized index.
Understanding AQI Components
The AQI is based on concentrations of key pollutants, including ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Each pollutant has its own concentration scale and health impact thresholds.
Steps to Calculate AQI
Calculating the AQI involves several steps:
- Measure the concentration of pollutants using monitoring stations.
- Identify the pollutant with the highest concentration relative to its standard.
- Use the corresponding formula or lookup table to convert concentration to AQI value.
- Determine the overall AQI as the highest individual pollutant AQI.
Using AQI Data
The calculated AQI is categorized into different levels indicating health risk, such as Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous. Authorities use this information to issue health advisories and implement pollution control measures.