What it does

IQAir AirVisual is the most trusted global air quality monitoring app, providing real-time AQI (Air Quality Index) data for particulate matter (PM2.5, PM10), ozone, nitrogen dioxide, and other pollutants from over 80,000 sensors worldwide. Korea is densely covered with government and IQAir-owned monitoring stations, giving block-level accuracy in Seoul and station-level data across the rest of the country. The app displays current conditions, hourly and daily forecasts, historical pollution trends, and health recommendations based on current readings. It also tracks wildfire smoke and pollen levels, which affect Korea seasonally. The app provides push alerts when air quality deteriorates past user-set thresholds.

Why travelers need it

Korea experiences severe fine-dust (미세먼지) episodes, particularly in late winter and spring, when yellow dust from Chinese deserts combines with local industrial emissions. On bad days, PM2.5 levels can exceed 150 µg/m³ — well into the 'hazardous' range by international standards. AirVisual is the most reliable way to know whether you need an N95 mask before heading out, which neighborhoods to avoid, and whether outdoor activities are safe. Many travelers check AirVisual each morning the same way they check the weather forecast. The app is particularly important for travelers with asthma, allergies, or respiratory sensitivities, as Korea's air quality can change dramatically within a few hours.

Key features

Real-time AQI data from 80,000+ monitoring stations worldwide with dense coverage in Korea.
Hourly and daily PM2.5 / PM10 forecasts with color-coded health advisories for each reading.
Push notifications when air quality reaches user-configured alert thresholds.
Historical pollution data and trends by day, week, month, or year for any monitored location.
Wildfire smoke tracking and pollen forecasts layered on top of the AQI map.

Pros & cons

Strengths

Most accurate air quality data for Korea among consumer apps — government stations + IQAir's own sensors.
Clean, intuitive interface without ads or in-app purchases required for core functionality.
Widget support for glancing at current AQI without opening the app.

Caveats

Forecast accuracy drops beyond 48 hours — the 7-day air quality forecast is less reliable.
Coverage in rural Korea is sparser than in Seoul / Busan / Incheon.
The app is fairly power-hungry when location services are active in the background.

How to install

1Open the Apple App Store or Google Play and search 'AirVisual' or 'IQAir AirVisual'.
2Install the app by IQAir AG.
3Grant location permission on first launch so the app can auto-detect your nearest monitoring station.
4Optionally set an AQI alert threshold (e.g., 100+ for 'Unhealthy for sensitive groups') to receive push warnings.

Basic usage

The home screen shows the current AQI for your detected location — color-coded green (good) through maroon (hazardous).
Swipe down to see the hourly forecast and daily outlook for the next 7 days.
Tap the map icon to view AQI readings across all of Korea — useful when planning day trips.
Check the 'Health & Activity' recommendations section for guidance on mask usage and outdoor exercise limits.

Tips for foreign travelers

Set your alert threshold to PM2.5 ≥ 100 (Red / 'Unhealthy') — Korea's own air quality index is more lenient than WHO standards, so the international AQI scale is more protective.
Check the 3-day forecast before scheduling outdoor activities like Namsan hikes or Han River bike rides.
In spring (March–May), check both the AQI and pollen forecasts — the yellow dust season brings both PM10 spikes and high pollen simultaneously.