Real-Time Air Quality Checker & AQI Health
Check real-time Air Quality Index (AQI), PM2.5, PM10, and ozone pollution levels worldwide with health advice and outdoor activity recommendations.
Air Quality Summary
Offline DatabaseAir quality is satisfactory, and air pollution poses little or no risk to the general public.
Clinical Health Guidelines
Air quality is ideal for all outdoor activities, walking, and sports.
No restrictions. Great conditions for outdoor recreation.
Windows can remain open for natural fresh air circulation.
No protective respirator or N95 mask necessary.
Exercise & Workout Risk Estimator
High respiratory ventilation during aerobic training increases pollutant intake by 4x to 10x.
About this tool
How to use it
- Select a global city from the quick list, or search by city name, country, or geographical coordinates.
- Inspect the color-coded Air Quality Index (AQI) score, ranging from Good (0-50) to Hazardous (300+).
- Review individual pollutant concentrations including PM2.5, PM10, Ground-level Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), and Carbon Monoxide (CO).
- Consult actionable health advice for sensitive groups, children, elderly, and outdoor athletic exercise.
- Use the Outdoor Activity Risk Calculator to estimate safe jogging, cycling, or walking durations based on current air pollution levels.
Why it matters
Air quality fluctuates rapidly due to urban vehicle emissions, industrial activity, weather inversions, and wildfire smoke plumes. Fine particulate matter (PM2.5) penetrates deep into lung tissue and the bloodstream. Having an instant, client-side reference and live checker allows individuals with asthma, parents, athletes, and travelers to protect their respiratory health.
When to use it
Check before planning outdoor morning runs, high-intensity workouts, opening house windows, sending children outside for sports, or traveling to industrial metropolitan regions.
Common questions
What is the difference between PM2.5 and PM10?
PM2.5 particles are under 2.5 micrometers in diameter (about 30 times smaller than a human hair) and can bypass the respiratory tract's natural filters to reach the bloodstream. PM10 includes larger particles like dust, pollen, and mold spores that irritate the eyes, throat, and upper airways.
What do the EPA AQI color codes mean?
Green (0-50) is Good; Yellow (51-100) is Moderate; Orange (101-150) is Unhealthy for Sensitive Groups; Red (151-200) is Unhealthy; Purple (201-300) is Very Unhealthy; and Maroon (301-500) is Hazardous.
Does a standard surgical mask protect against PM2.5 wildfire smoke?
No. Standard cloth or loose surgical masks do not filter fine sub-micron particles. For genuine protection against PM2.5 and wildfire smoke, tightly fitted N95, KN95, or FFP2 respirators are required.
How does this tool provide data without mandatory external accounts?
The tool includes an extensive embedded offline database of 40+ global major cities, alongside an optional real-time fetch to the open CORS Open-Meteo Air Quality API for live continuous atmospheric readings.