🔥 Wildfire season is here — check before you head out

Is the air safe outside?

Real-time air quality and wildfire smoke check for any city. One number, one color, clear advice — no sign-up, free forever.

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Athens, Attica, Greece

37

😊 Good

US AQI · updated 2026-07-07 11:00 local

Air is clean. Great time for outdoor activities and exercise.

Sensitive groups: No precautions needed for anyone.

PM2.5: 8.5 µg/m³PM10: 12.3 µg/m³

Next 72 hours — PM2.5 forecast

Bar color = US AQI category for that hour

2026-07-07 11:00 — PM2.5: 8.5 µg/m³, AQI: 37 (Good)2026-07-07 12:00 — PM2.5: 8.6 µg/m³, AQI: 37 (Good)2026-07-07 13:00 — PM2.5: 9.0 µg/m³, AQI: 38 (Good)2026-07-07 14:00 — PM2.5: 9.3 µg/m³, AQI: 39 (Good)2026-07-07 15:00 — PM2.5: 9.6 µg/m³, AQI: 39 (Good)2026-07-07 16:00 — PM2.5: 9.6 µg/m³, AQI: 41 (Good)2026-07-07 17:00 — PM2.5: 8.5 µg/m³, AQI: 45 (Good)2026-07-07 18:00 — PM2.5: 9.0 µg/m³, AQI: 48 (Good)2026-07-07 19:00 — PM2.5: 8.2 µg/m³, AQI: 51 (Moderate)2026-07-07 20:00 — PM2.5: 8.3 µg/m³, AQI: 54 (Moderate)2026-07-07 21:00 — PM2.5: 8.7 µg/m³, AQI: 52 (Moderate)2026-07-07 22:00 — PM2.5: 11.5 µg/m³, AQI: 49 (Good)2026-07-07 23:00 — PM2.5: 12.6 µg/m³, AQI: 46 (Good)2026-07-08 00:00 — PM2.5: 13.9 µg/m³, AQI: 43 (Good)2026-07-08 01:00 — PM2.5: 15.3 µg/m³, AQI: 43 (Good)2026-07-08 02:00 — PM2.5: 16.3 µg/m³, AQI: 44 (Good)2026-07-08 03:00 — PM2.5: 16.7 µg/m³, AQI: 44 (Good)2026-07-08 04:00 — PM2.5: 15.9 µg/m³, AQI: 45 (Good)2026-07-08 05:00 — PM2.5: 16.0 µg/m³, AQI: 46 (Good)2026-07-08 06:00 — PM2.5: 16.2 µg/m³, AQI: 47 (Good)2026-07-08 07:00 — PM2.5: 16.2 µg/m³, AQI: 47 (Good)2026-07-08 08:00 — PM2.5: 15.5 µg/m³, AQI: 48 (Good)2026-07-08 09:00 — PM2.5: 15.3 µg/m³, AQI: 49 (Good)2026-07-08 10:00 — PM2.5: 14.6 µg/m³, AQI: 50 (Good)2026-07-08 11:00 — PM2.5: 14.3 µg/m³, AQI: 50 (Good)2026-07-08 12:00 — PM2.5: 13.4 µg/m³, AQI: 51 (Moderate)2026-07-08 13:00 — PM2.5: 14.5 µg/m³, AQI: 51 (Moderate)2026-07-08 14:00 — PM2.5: 14.7 µg/m³, AQI: 52 (Moderate)2026-07-08 15:00 — PM2.5: 13.4 µg/m³, AQI: 52 (Moderate)2026-07-08 16:00 — PM2.5: 14.1 µg/m³, AQI: 53 (Moderate)2026-07-08 17:00 — PM2.5: 15.7 µg/m³, AQI: 53 (Moderate)2026-07-08 18:00 — PM2.5: 15.7 µg/m³, AQI: 64 (Moderate)2026-07-08 19:00 — PM2.5: 16.1 µg/m³, AQI: 81 (Moderate)2026-07-08 20:00 — PM2.5: 15.3 µg/m³, AQI: 92 (Moderate)2026-07-08 21:00 — PM2.5: 14.2 µg/m³, AQI: 98 (Moderate)2026-07-08 22:00 — PM2.5: 14.5 µg/m³, AQI: 99 (Moderate)2026-07-08 23:00 — PM2.5: 15.1 µg/m³, AQI: 94 (Moderate)2026-07-09 00:00 — PM2.5: 15.3 µg/m³, AQI: 83 (Moderate)2026-07-09 01:00 — PM2.5: 15.4 µg/m³, AQI: 67 (Moderate)2026-07-09 02:00 — PM2.5: 15.6 µg/m³, AQI: 57 (Moderate)2026-07-09 03:00 — PM2.5: 15.9 µg/m³, AQI: 57 (Moderate)2026-07-09 04:00 — PM2.5: 19.0 µg/m³, AQI: 57 (Moderate)2026-07-09 05:00 — PM2.5: 16.7 µg/m³, AQI: 57 (Moderate)2026-07-09 06:00 — PM2.5: 16.9 µg/m³, AQI: 57 (Moderate)2026-07-09 07:00 — PM2.5: 16.8 µg/m³, AQI: 57 (Moderate)2026-07-09 08:00 — PM2.5: 14.6 µg/m³, AQI: 57 (Moderate)2026-07-09 09:00 — PM2.5: 14.2 µg/m³, AQI: 57 (Moderate)2026-07-09 10:00 — PM2.5: 11.9 µg/m³, AQI: 57 (Moderate)2026-07-09 11:00 — PM2.5: 11.0 µg/m³, AQI: 57 (Moderate)2026-07-09 12:00 — PM2.5: 10.8 µg/m³, AQI: 56 (Moderate)2026-07-09 13:00 — PM2.5: 10.7 µg/m³, AQI: 56 (Moderate)2026-07-09 14:00 — PM2.5: 10.4 µg/m³, AQI: 56 (Moderate)2026-07-09 15:00 — PM2.5: 10.6 µg/m³, AQI: 55 (Moderate)2026-07-09 16:00 — PM2.5: 9.9 µg/m³, AQI: 55 (Moderate)2026-07-09 17:00 — PM2.5: 9.0 µg/m³, AQI: 55 (Moderate)2026-07-09 18:00 — PM2.5: 8.4 µg/m³, AQI: 54 (Moderate)2026-07-09 19:00 — PM2.5: 8.2 µg/m³, AQI: 57 (Moderate)2026-07-09 20:00 — PM2.5: 9.2 µg/m³, AQI: 57 (Moderate)2026-07-09 21:00 — PM2.5: 10.6 µg/m³, AQI: 52 (Moderate)2026-07-09 22:00 — PM2.5: 12.8 µg/m³, AQI: 52 (Moderate)2026-07-09 23:00 — PM2.5: 14.7 µg/m³, AQI: 52 (Moderate)peak 19 µg/m³Tue, Jul 7Wed, Jul 8Thu, Jul 9

What the colors mean

The US Air Quality Index (AQI) grades air from 0 to 500 in six color-coded levels.

0–50

😊 Good

Air is clean. Great time for outdoor activities and exercise.

51–100

🙂 Moderate

Air is acceptable. Outdoor activities are fine for most people.

101–150

😐 Unhealthy for Sensitive Groups

General public is OK, but keep outdoor efforts light and take breaks.

151–200

😷 Unhealthy

Avoid prolonged outdoor exertion. Wear an N95/KN95 mask outside and run an air purifier indoors.

201–300

🚨 Very Unhealthy

Stay indoors with windows closed. Use an air purifier. N95 mask is a must if you have to go out.

301+

☠️ Hazardous

Health emergency. Everyone should stay indoors, seal windows, and run air purifiers continuously.

🔥 Why is wildfire smoke dangerous?

Wildfire smoke is packed with fine particles (PM2.5) small enough to travel deep into your lungs and enter your bloodstream. Even hundreds of kilometers from a fire, smoke can push air quality into unhealthy ranges. Short-term exposure irritates eyes and airways; it's especially risky for children, older adults, pregnant people, and anyone with asthma, heart or lung conditions.

🔬 What is PM2.5?

PM2.5 means particulate matter smaller than 2.5 micrometers — about 1/30 the width of a human hair. It's the main harmful ingredient of wildfire smoke, and also comes from traffic and industry. The WHO recommends keeping 24-hour average exposure below 15 µg/m³. When PM2.5 spikes, an N95/KN95 mask outdoors and a HEPA air purifier indoors make a real difference.

😷 When should I wear a mask?

From AQI 151 (red, “Unhealthy”) upward, everyone benefits from wearing a well-fitted N95/KN95 outdoors. Sensitive groups should consider one from AQI 101 (orange). Cloth and surgical masks do little against fine smoke particles.

🏠 What helps indoors?

Close windows and doors, run an air purifier with a HEPA filter, and avoid adding indoor smoke (candles, frying). If you don't own a purifier, a box fan taped to a furnace filter is a proven budget alternative during smoke events.