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Common AQI Monitoring Questions in 2026

June 18, 2026 · The Clime Team
Common AQI Monitoring Questions in 2026

The Air Quality Index (AQI) is a vital tool for assessing and communicating air quality levels, directly impacting public health and environmental policies. In 2026, understanding AQI monitoring has become increasingly important due to heightened awareness of air pollution's effects.

What is the Air Quality Index (AQI)?

The AQI is a standardized system developed by the U.S. Environmental Protection Agency (EPA) to report daily air quality levels. It focuses on major pollutants regulated by the Clean Air Act, including ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. The AQI translates concentrations of these pollutants into a scale from 0 to 500, where higher values indicate greater pollution levels and associated health risks. (airnow.gov)

How is the AQI Calculated?

The AQI is calculated by converting the concentration of each pollutant into an index value using specific breakpoints. Each pollutant has its own set of breakpoints that correspond to different AQI categories, ranging from "Good" to "Hazardous." The highest AQI value among all pollutants determines the overall AQI for a location. (aqs.epa.gov)

What Do Different AQI Levels Indicate?

The AQI is divided into six categories, each representing a different level of health concern:

  • Good (0-50): Air quality is satisfactory, posing little or no risk.

  • Moderate (51-100): Air quality is acceptable; however, there may be some health concern for a small number of unusually sensitive individuals.

  • Unhealthy for Sensitive Groups (101-150): Sensitive individuals may experience health effects; the general public is less likely to be affected.

  • Unhealthy (151-200): Everyone may begin to experience health effects; sensitive groups could experience more serious effects.

  • Very Unhealthy (201-300): Health alert: everyone may experience more serious health effects.

  • Hazardous (301 and higher): Health warning of emergency conditions: the entire population is more likely to be affected. (airnow.gov)

How Can I Access AQI Information?

AQI data is readily accessible through various platforms:

  • Online Resources: Websites like AirNow provide real-time AQI information for locations across the United States.

  • Mobile Applications: The AirNow app offers AQI updates and health recommendations on the go.

  • Local News and Weather Forecasts: Many local media outlets include AQI information in their broadcasts.

How Should I Respond to Different AQI Levels?

Your response to AQI levels should be tailored to your health status and activity plans:

  • Good to Moderate (0-100): Generally safe for all outdoor activities.

  • Unhealthy for Sensitive Groups (101-150): Sensitive individuals should limit prolonged outdoor exertion.

  • Unhealthy (151-200): Sensitive individuals should avoid prolonged outdoor exertion; everyone else should limit prolonged outdoor exertion.

  • Very Unhealthy (201-300): Sensitive individuals should avoid all outdoor exertion; everyone else should limit outdoor exertion.

  • Hazardous (301 and higher): Everyone should avoid all outdoor activities. (airnow.gov)

How Does Clime Support AQI Monitoring?

Clime offers advanced air quality monitoring solutions that provide real-time AQI data, empowering users to make informed decisions about their health and activities. With Clime's user-friendly interface, individuals can access localized AQI information, receive health advisories, and track air quality trends over time. This comprehensive approach ensures that users are equipped with the necessary tools to navigate varying air quality conditions effectively.

By staying informed about AQI levels and utilizing resources like Clime, individuals can proactively manage their exposure to air pollutants, safeguarding their health and well-being.

Highlights:

  • 2026 PM2.5 Exceedances | US EPA, Published on Tuesday, April 14
  • AirData - Tile Plot | US EPA, Published on Tuesday, March 24
  • What Do My Sensor Readings Mean? Sensor Scale Pilot Project | US EPA, Published on Sunday, April 19

Frequently Asked Questions