Air Quality Monitoring
Know what you're breathing. Track current air quality and pollutant levels with regional monitoring reports and global model forecasts.
Availability, coverage, update frequency, and alert delivery vary by data source, region, subscription plan, device permissions, and service conditions. Air-quality values carry source and time information and may come from monitoring reports or model forecasts. They do not determine personal health risk: how a given reading affects you depends on the pollutant, your own sensitivity and symptoms, and local public-health guidance.
5-Day Forecast View
Today's Detail View
Current AQI
Air quality index with color-coded categories from Good to Hazardous. Check the source and time to distinguish monitoring reports from model estimates.
5-Day Forecast
Plan ahead with air quality predictions for the next five days.
Primary Pollutant
See which pollutant is affecting your area most right now.
Comprehensive Air Quality Data
US EPA Data
Free access to AirNow.gov data from official EPA monitoring stations across the United States.
Global Coverage
Standard and Pro include global model forecasts from Open-Meteo using CAMS. These are estimates for a model grid, not readings from a monitor at your address. Available pollutants, forecast range, and update timing vary by region and product.
Pollutant Breakdown
See detailed levels for PM2.5, PM10, Ozone, Nitrogen Dioxide, Sulfur Dioxide, and Carbon Monoxide.
Health Guidance
Understand what each AQI level means with clear health recommendations for sensitive groups and the general population.
Dual Standards
Choose between US AQI and EU AQI standards, with automatic detection based on your location.
Hourly Trends
Visualize how air quality changes throughout the day with hourly trend charts and peak hour identification.
Who Benefits from Air Quality Monitoring?
Sensitive Groups
Challenge: Children, elderly, and those with health conditions are more vulnerable to poor air quality.
AQI categories clearly indicate when air quality is unhealthy for sensitive groups, so you can take precautions before symptoms appear.
Parents
Challenge: Protecting children from poor air quality during outdoor play and school activities.
Forecast days help plan outdoor activities on cleaner air days, and the AQI category names which groups a given reading affects first.
Outdoor Athletes
Challenge: Training safely without inhaling harmful pollutants during exercise.
Hourly trends reveal the best times to run, cycle, or exercise outdoors. Avoid peak pollution hours and maximize performance.
Asthma & Respiratory Conditions
Challenge: Avoiding specific pollutants that trigger respiratory symptoms.
Detailed pollutant breakdown shows exactly which substances are elevated. Know whether it's ozone, particulates, or other triggers affecting your area.
How People Use Air Quality Data
Managing a respiratory condition
The pollutant breakdown shows which substance is actually elevated, so a high-ozone day and a high-particulate day can be told apart instead of collapsing into one number. Hourly detail shows whether conditions are still climbing or already clearing.
Timing outdoor exercise
Hourly AQI trends show when pollution peaks and when it eases, which usually matters more for a morning run than the daily headline number. Chat can read the same air quality data back in plain language if you would rather ask than scan a chart.
Use Case
WeatherAI for Runners
Plan safe runs with AQI data, heat index alerts, and hour-by-hour forecasts.
Use Case
WeatherAI for Cyclists
Check air quality, wind, and conditions before every ride.
Use Case
WeatherAI for Gardeners
Monitor air quality and weather conditions for healthier outdoor gardening.
Breathe Easier with Better Data
Download WeatherAI to start monitoring air quality. Free across the U.S. and Canada; Standard and Pro extend the same detail worldwide.
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Frequently Asked Questions
What is the Air Quality Index (AQI)?
The AQI converts pollutant concentrations into a single number with a category and a health message. EPA defines breakpoints from 0 to 500: 0-50 is Good, 51-100 Moderate, and above 100 increasingly unhealthy. During severe wildfire smoke, readings can exceed 500, which AirNow describes as beyond the AQI. WeatherAI shows current AQI with its source and timestamp, alongside the standard category guidance. Coverage, pollutants, and update frequency vary by region and provider.
What pollutants does WeatherAI track?
WeatherAI monitors PM2.5 (fine particles), PM10 (coarse particles), ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide levels.
How often does air quality data update?
Update timing depends on the source. Regional monitoring reports carry observation timestamps. Global air-quality data comes from Open-Meteo using CAMS models, with hourly forecast values for up to five days. Hourly values do not mean a new model run every hour; check the displayed source and time.
Related Reading & Tools
Deepen the topic with explainers, calculators, and adjacent features.
Tool
Heat Index Calculator
Calculate how hot it really feels when humidity is part of the story.
Guide
'Feels Like' Temperature Explained
What apparent temperature really means and how wind chill and heat index are calculated.
Use Case
Weather App for Runners
Time runs around heat, humidity, and air quality with hour-by-hour conditions.