Your current reading
—US AQI
Locating
We’re reading the atmosphere around you.
What is driving it—
Pollutant context will appear with your local report.
Live air reportUpdating now
Current air quality
Loading the latest AQI and pollutant data for your location.
Approximate location only.
We never store your IP.
US AQI—LOCATING
05-day outlook
The week
at a glance.
Today—Loading
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Read the number
What this AQI means.
AQI compresses several pollutants into one health signal. The reported number is driven by the highest pollutant sub-index — not an average.
0—50—
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←51—100—
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←101—150—
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←151—200—
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←201—300—
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←301+—
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←Hyperlocal, hour by hour
A high-resolution forecast tuned to where you actually are — not a generic city average.
Ground stations, live
Cross-check the forecast against real monitoring stations on our interactive map.
Made for your day
We turn raw pollutant data into clear, personal decisions — for exercise, family, and going out.
Your next 24 hours
Find the clean-air window.
We’ll highlight the best time to head outside as soon as your local forecast arrives.
Move or tap anywhere on the curve to inspect an hour
—US AQI—
Dominant pollutant—
- PM2.5
- —µg/m³
- PM10
- —µg/m³
- O₃
- —µg/m³
- NO₂
- —µg/m³
- SO₂
- —µg/m³
- CO
- —µg/m³
Under the surface
What’s in the air?
The index is the headline. These are the ingredients — measured as estimated surface concentrations.
01
PM2.5
Fine particles
- Typical sources
- —
- Why it matters
- —
—µg/m³
02
PM10
Coarse particles
- Typical sources
- —
- Why it matters
- —
—µg/m³
03
NO₂
Traffic emissions
- Typical sources
- —
- Why it matters
- —
—µg/m³
04
O₃
Ground-level ozone
- Typical sources
- —
- Why it matters
- —
—µg/m³
05
SO₂
Fuel combustion
- Typical sources
- —
- Why it matters
- —
—µg/m³
06
CO
Carbon monoxide
- Typical sources
- —
- Why it matters
- —
—µg/m³
Your day, adjusted
Small choices.
Cleaner breaths.
Turn today’s reading into a practical plan for people, exercise and indoor air.
Today’s action plan04 scenarios
Checking today’s activity level
Loading your local guidance…
Checking extra precautions
Personal advice is on its way…
Planning your training
Checking the cleanest activity window…
Planning ventilation
Checking outdoor conditions…
Pause and act on symptoms
Unusual coughing, wheezing, chest tightness, shortness of breath or fatigue are cues to stop, move to cleaner air and follow medical advice.
Before your next stop