BelAir vs GUS
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
BelAir
Provides real-time and forecasted air quality scores across Belgium. It uses a comprehensive index based on various pollutants and offers insights into long-term air quality trends and health impacts.
- Real-time air quality scores
- Air quality forecasts
- Long-term air quality evolution
- BelAQI index explanation
- Pollutant concentration data
- Health impact insights
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BelAIR air quality app The BelAIR app gives a score, ranging from "very good" to "horrible", of the current air quality everywhere in Belgium. The app also makes a forecast of the air quality for the next few days and gives an idea of the long-term evolution of air quality. Measuring and modelling The three regions in Belgium have a network of more than 100 automatic measuring stations that measure the air quality very accurately. However, it is impossible to deploy these expensive devices everywhere. Using computer programmes, we calculate the air quality in places where no measurements are made. Together with the available measurements, an estimate of the air quality at each location in Belgium can then be made. BelAQI air quality index How good or bad the current air quality is depends on the concentrations of different substances in the air. The BelAQI air quality index is used to assess the air quality. It gives the air quality a rating from "very good" to "horrible". To calculate the BelAQI, the concentrations of various substances (nitrogen dioxide, particulate matter and ozone) are taken into account. For these substances, an individual assessment is made based on the short-term health effects. The worst assessed determines the overall BelAQI. Air quality in the long term The BelAIR app not only gives an idea of the day-to-day (or sometimes even hour-to-hour) variation in air quality at a location at the moment, but also gives an idea of the air quality in the long term. The annual average concentrations for a location are compared with the European limit values and the World Health Organisation's health advisory values. This gives an idea of the long-term impact of air pollution on health.
GUS
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Download de GUS health app met de volgende functionaliteiten: - Aanmelden bij ons - Inplannen van trainingen - Beheren van je boekingen - Communiceren met ons - Beheren van je profiel en voorkeuren - Push notificaties over wijzigingen van de training - Synchroniseren van de agenda
Screenshots
Verdict
The clearest difference is update cadence: BelAir at every 2 months against GUS's every 8 months. BelAir also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BelAir ships an update every 2 months, GUS every 8 months. The most recent releases landed on October 20, 2026 and October 28, 2026 respectively.
| Parameter | BelAir | GUS |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 12.2% of reviews | โ |
| Update frequency | Every 2 months โ better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | โ |
| Devices | iPhone, iPad, iPod โ better | iPhone, iPod |
| Requires iOS | 13.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 60 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Belgian Interregional Environment Agency (IRCEL - CELINE) | Trainin |
In-app purchases
BelAir
No in-app purchases
GUS
No in-app purchases









