Know if the air outside is safe before you step out.
Search any city for current air quality, fine particles, ozone, weather context, and a simple recommendation for running, walking, commuting, or keeping kids indoors.
Fast answers, not raw numbers.
Plain-English outdoor advice
AQI and particles are translated into simple guidance for exercise, windows, kids, and sensitive groups.
Live environmental signals
Uses public Open-Meteo weather and air-quality endpoints for quick global coverage without login friction.
Useful city pages
Build local pages around high-intent searches like “air quality in Austin today” and “PM2.5 Los Angeles.”
Popular city checks
Air quality guide
Air quality changes throughout the day. Wind, wildfire smoke, traffic, temperature inversions, and industrial activity can all affect what you breathe. The most useful quick checks are AQI, PM2.5, PM10, and ozone.
What is PM2.5?
PM2.5 means fine particulate matter smaller than 2.5 micrometers. These particles can travel deep into the lungs, so they are especially important for people with asthma, heart disease, children, older adults, and anyone exercising outdoors.
When should I limit outdoor exercise?
If the AQI is over 100, sensitive groups should reduce prolonged or heavy exertion. If the AQI is over 150, everyone should consider moving strenuous activity indoors.
Disclaimer
This site is informational only and is not medical advice. Follow local public health guidance and consult a qualified professional for health decisions.