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Air Quality Basics Cheat Sheet

June 18, 2026 · The Clime Team
Air Quality Basics Cheat Sheet

Understanding air quality is essential for maintaining health and well-being. The Air Quality Index (AQI) is a standardized system used to communicate daily air quality levels and associated health risks.

What Is the Air Quality Index (AQI)?

The AQI is a color-coded scale that measures the concentration of five major air pollutants: ground-level ozone, particulate matter (PM10 and PM2.5), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Each pollutant has its own AQI scale, and the highest value among them determines the overall AQI for a location. An AQI value of 100 generally corresponds to the level of the short-term National Ambient Air Quality Standard for that pollutant. (epa.gov)

AQI Categories and Health Implications

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

  • 0-50 (Good): Air quality is satisfactory, and air pollution poses little or no risk.

  • 51-100 (Moderate): Air quality is acceptable; however, there may be a moderate health concern for a small number of people sensitive to air pollution.

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

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

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

  • 301-500 (Hazardous): Health warnings of emergency conditions; the entire population is more likely to be affected. (dep.wv.gov)

Monitoring Air Quality

To stay informed about local air quality, regularly check resources like the AirNow Fire and Smoke Map, which provides real-time data on air pollution levels, sources, and health advisories. Additionally, the National Weather Service (NWS) offers air quality forecasts and alerts to help you plan outdoor activities safely. (epa.gov)

Protecting Yourself During Poor Air Quality

When the AQI indicates unhealthy air quality, consider the following precautions:

  • Limit Outdoor Activities: Reduce or reschedule strenuous activities, especially if you are sensitive to air pollution.

  • Stay Indoors: Keep windows and doors closed to minimize exposure.

  • Use Air Purifiers: Utilize air purifiers with HEPA filters to reduce indoor pollution levels.

  • Monitor Symptoms: Be alert to any respiratory issues or other health symptoms and seek medical advice if necessary.

Improving Air Quality

While individual actions can help reduce personal exposure, collective efforts are essential for improving overall air quality. Support policies and initiatives aimed at reducing emissions from transportation, industry, and other sources. Engage in community programs focused on environmental sustainability and advocate for cleaner air practices.

By understanding the AQI and taking appropriate actions, you can protect your health and contribute to a cleaner environment.

Highlights:

  • Air Quality Index
  • Using Air Quality Index | AirNow.gov
  • AQI Basics | AirNow.gov

Frequently Asked Questions