This means to measure and evaluate the concentration of pollutants, particulate matter, and harmful gases present in the ambient air of a specific location. This process informs the public whether the air is safe to breathe or if it poses a short-term or long-term health risk. Air quality is evaluated globally using standardized metrics, most notably the Air Quality Index (AQI).
How to Check Air Quality?
Air quality measures the cleanliness of outdoor and indoor air, directly dictating how safely you can breathe, exercise, and live. Measured by the Air Quality Index (AQI) on a scale from 0 to 500, air quality reflects the concentration of hazardous gases and microscopic particle pollution ($\text{PM}_{2.5}$) in the atmosphere. Knowing how to interpret these numbers prevents immediate lung irritation and guards against long-term respiratory disease.
How to Check Local Air Quality in 3 Steps
1. View Your Real-Time Local AQI Score
Visit AirNow.gov or your smartphone’s default weather app. Enter your zip code to instantly find your current local AQI number.
2. Decode the Color-Coded Health Risks
- Green (0–50): Good air; perfectly safe for outdoor activities.
- Yellow (51–100): Moderate air; highly sensitive individuals should monitor symptoms.
- Orange (101–150): Unhealthy for sensitive groups; children, seniors, and asthmatics should limit outdoor time.
- Red (151–200): Unhealthy for everyone; everyone should reduce strenuous outdoor exertion.
- Purple/Maroon (201+): Very unhealthy to hazardous; avoid all outdoor physical activity.
3. Identify the Dominant Pollutant
Check if your local alert is driven by ground-level ozone (common on hot, sunny summer afternoons) or particulate matter ($\text{PM}_{2.5}$ and $\text{PM}_{10}$), which stems from wildfire smoke, dust storms, and vehicle exhaust.
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