What is a safe AQI level?

AQI 0-50 is considered good and safe for everyone.

Can I exercise outdoors when AQI is above 100?

Reduce intensity and duration. Move exercise to early morning.

Do air purifiers help?

Yes. HEPA purifiers reduce indoor PM2.5 by 50-80%.

How accurate is the Free Air Quality Monitor?

It provides real-time AQI data from government monitoring stations.

Does AQI improve at night?

Often yes. Traffic decreases, temperatures drop. Early morning and late evening typically have lower AQI.

How to Understand Air Quality Index and Protect Your Health

What AQI Numbers Actually Mean

AQI is a scale from 0-500 measuring air pollution. 0-50 (Green): Good. No risk. 51-100 (Yellow): Moderate. Sensitive people affected. 101-150 (Orange): Unhealthy for sensitive groups. 151-200 (Red): Unhealthy for everyone. 201-300 (Purple): Very unhealthy. 301+ (Maroon): Hazardous.

Who Is Most at Risk

Children: Breathe faster, lungs developing. Elderly (65+): Weakened immune systems. People with asthma: Even moderate AQI can trigger attacks. Pregnant women: Poor air linked to low birth weight. Outdoor workers: Prolonged exposure.

Step-by-Step: Protect Yourself

1. Check the Air Quality Monitor every morning. 2. If AQI above 100: limit outdoor exercise. 3. If AQI above 150: wear N95 masks outdoors. 4. If AQI above 200: stay indoors entirely. 5. Use air purifiers indoors when AQI is elevated.

Common Sources of Poor Air Quality

Traffic pollution: Vehicles emit NO2 and PM2.5. Wildfire smoke: Can travel thousands of miles. Industrial emissions: Worse on hot, still days. Construction dust: PM10 particles. Indoor sources: Cooking, candles, cleaning products.

Quick Reference: AQI Action Guide

0-50: Enjoy outdoor activities. 51-100: Monitor symptoms. 101-150: Limit outdoor exercise. 151-200: Reduce all outdoor activity. 201-300: Stay indoors. 301+: Emergency — stay inside.

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