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Understanding Air Quality Alerts: A Guide for Non-Technical Users

June 17, 2026 · The Clime Team
Understanding Air Quality Alerts: A Guide for Non-Technical Users

Air quality alerts are notifications issued when pollutants in the air reach levels that may pose health risks. These alerts are crucial for individuals sensitive to air pollution, such as those with respiratory conditions, children, and older adults.

What Are Air Quality Alerts?

Air quality alerts are issued when pollutants in the air, like ground-level ozone and fine particles, reach levels that may pose health risks. These alerts are crucial for individuals sensitive to air pollution, such as those with respiratory conditions, children, and older adults.

How Are Air Quality Levels Measured?

The U.S. Environmental Protection Agency (EPA) uses the Air Quality Index (AQI) to communicate air quality levels. The AQI ranges from 0 to 500, with higher values indicating worse air quality. The EPA categorizes AQI values into six levels:

  • 0 to 50 – Good: Air quality is satisfactory and poses little or no risk.
  • 51 to 100 – Moderate: Air quality is acceptable; however, some pollutants may pose a moderate health concern for sensitive individuals.
  • 101 to 150 – Unhealthy for Sensitive Groups: Sensitive individuals may experience health effects; the general public is less likely to be affected.
  • 151 to 200 – Unhealthy: Everyone may begin to experience health effects; sensitive groups may experience more serious effects.
  • 201 to 300 – Very Unhealthy: Health alert; everyone may experience more serious health effects.
  • 301 to 500 – Hazardous: Health warning of emergency conditions; the entire population is more likely to be affected.

Why Are Air Quality Alerts Important?

Exposure to poor air quality can lead to various health issues, including:

  • Aggravation of respiratory conditions like asthma and COPD.
  • Increased risk of heart attacks and strokes.
  • General discomfort, such as coughing and shortness of breath.

Even individuals without pre-existing health conditions can experience adverse effects when exposed to polluted air. (health.clevelandclinic.org)

How Can You Stay Informed?

To receive timely air quality alerts, consider the following options:

  • Mobile Applications: Many regions offer apps that provide real-time air quality information and alerts. For example, the South Coast Air Quality Management District offers an app that delivers accurate air quality data tailored to your location. (aqmd.gov)

  • Email and Text Notifications: Services like EnviroFlash allow you to sign up for email or text alerts about air quality conditions in your area. These notifications can be customized based on your health concerns and preferred alert levels. (epa.gov)

  • Local News and Weather Reports: Stay updated by checking local news outlets and weather forecasts, which often include air quality information. The EPA's AirNow website also provides daily air quality forecasts for over 400 cities across the country. (epa.gov)

What Should You Do When an Air Quality Alert Is Issued?

When an air quality alert is in effect, it's important to take precautions to protect your health:

  • Limit Outdoor Activities: Reduce the time spent outdoors, especially during peak pollution hours.
  • Stay Indoors: Keep windows and doors closed to prevent outdoor air from entering your home.
  • Use Air Purifiers: Consider using air purifiers with HEPA filters to improve indoor air quality.
  • Monitor Health Symptoms: Be vigilant for any signs of respiratory distress, such as coughing, wheezing, or shortness of breath.

By staying informed and taking appropriate actions during air quality alerts, you can significantly reduce the health risks associated with air pollution.

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