LaGuardia’s Terminal B just started piloting a robot dog to monitor air quality between gates. That kind of granular, walk-by sensing is finally coming down to the consumer phone too, and the apps that surface AQI data on Android now range from bare-bones government feeds to full smart-home hubs. We tested seven of the best apps for air quality monitoring, focused on how quickly they read your location, how honest their source data is, and whether the free tier is actually usable.
Our picks skew toward apps that surface station-level data (not modeled estimates), refresh fast, and don’t smuggle in ads or paywalls for the number you actually want.
What matters in an air quality app
- Source honesty. Is this data from a real monitoring station or a model? Model-only apps miss local hotspots.
- Sensor coverage. How many nearby stations does the app know about? A single reference station 15 km away is worse than three community sensors within a mile.
- Notifications. Can you set thresholds and get pushed when AQI crosses them? Critical for asthma, kids, or outdoor training.
- Offline behavior. Does the last reading persist without signal, or does the widget just say “loading”?
- Data export. Can you pull your history for a doctor’s visit or a landlord dispute?
- Ads and paywalls. How much of the free tier is real, and how quickly does the app push you toward a subscription?
Quick comparison
| App | Best for | Free plan | Paid tier | Data source |
|---|---|---|---|---|
| IQAir AirVisual | Global reference stations | Full core AQI | Pro ~$4/mo | Own network + government |
| Plume Flow | Wearable pairing | Wearable required | Sensor bundle | Own sensors |
| Air Matters | Multi-city dashboards | Full features | None (donations) | 180+ agencies |
| AirCare | Personal sensor network | Free | Sensor kit | Own community sensors |
| Withings Home | Indoor air | With Withings cam | Camera required | In-camera sensor |
| BreezoMeter | Fast local hyper-local | Free basic | Enterprise API | Modeled + station |
| Airly | Europe density | Free | Pro tier | Own dense sensors |
The apps
1. IQAir AirVisual — Best for reliable global reference data
IQAir AirVisual is the app most journalists cite in AQI stories, for good reason. It aggregates data from over 10,000 government monitoring stations plus IQAir’s own AirVisual Pro sensor network. The map interface color-codes cities globally, and you can tap any station for real-time PM2.5, PM10, ozone, and a rolled-up US AQI number.
Where it falls short: the “how healthy is my day” recommendation panel skews conservative, occasionally telling you to wear a mask on days most people would consider fine. The free tier now shows an interstitial ad on cold starts.
Pricing:
- Free: real-time AQI, forecasts, three saved locations
- Pro: about $4 per month, unlimited saved locations, historical trends, no ads
Platforms: Android, iOS, Web
Download: Google Play Aptoide
Bottom line: the default pick if you travel, or if you want the same source of truth AQI apps are compared against.
2. Plume Flow — Best for wearable-plus-app pairing
Plume Flow is the app half of Plume Labs’ Flow wearable, a pocket-sized personal AQI sensor. Without the wearable, the app functions as a nearby-station reader (using its map of validated public data), but the value shows up when you clip a Flow to your bag and see PM1, PM10, NO2, and VOC readings for the exact air you’re breathing, not just the block your nearest station sits on.
Where it falls short: the app alone is limited compared to IQAir. Full value requires the roughly $180 Flow sensor. Sensor accuracy has been questioned in independent tests, though generally within acceptable range for consumer use.
Pricing:
- Free app: nearby AQI, pollution map, no notifications
- Full experience: requires Flow sensor purchase
Platforms: Android, iOS
Download: Google Play Aptoide
Bottom line: pick this if you already own or plan to buy a Flow. Otherwise IQAir is the better standalone.
3. Air Matters — Best for multi-city dashboards
Air Matters pulls from 180+ air quality agencies across 40 countries and lets you build a dashboard of every city that matters to you: home, workplace, parents in another country, that vacation home. The widget updates every 10 minutes and the notification system supports threshold triggers (alert me when PM2.5 exceeds 50).
Where it falls short: interface looks a little dated compared to IQAir’s polished map view. Some regional coverage gets sparse outside major cities.
Pricing:
- Free: full features, no subscription
- Donation-supported development
Platforms: Android, iOS
Download: Google Play Aptoide
Bottom line: the pick for anyone who checks air quality in more than one place regularly.
4. AirCare — Best community sensor coverage
AirCare aggregates a mix of official monitoring stations and hobbyist community sensors (PurpleAir being the biggest contributor). In North America and parts of Europe, that means far more sensors per square kilometer than official station-only apps show. Wildfire season is when AirCare shines: while government sensors say “moderate,” a nearby PurpleAir sensor might say “hazardous” and AirCare will surface both.
Where it falls short: community sensors have variable calibration. Two sensors on the same block can disagree by 30 AQI. Coverage is thin outside North America and Europe.
Pricing:
- Free with full features
- Optional AirCare-branded sensor for backyard readings
Platforms: Android, iOS
Download: Google Play
Bottom line: the best pick during wildfire season or if you live somewhere with limited official monitoring.
5. Withings Home — Best for indoor air
Withings Home originally shipped as the app for the Withings Home camera, which included a built-in indoor air quality sensor. It’s the outlier on this list: it monitors your living room, not your neighborhood. If you already own a Withings Home or Home Plus, the app tracks VOCs and gives you a trend line of how bad indoor air got when you cooked bacon at 7pm.
Where it falls short: requires the camera to be useful. As a standalone air quality tool it’s essentially non-functional.
Pricing:
- Free app
- Camera hardware runs about $200 secondhand (discontinued new)
Platforms: Android, iOS
Download: Google Play Aptoide
Bottom line: only relevant if you already own the hardware. Otherwise skip.
6. BreezoMeter — Best for hyper-local modeled data
BreezoMeter takes a different approach: instead of reading from stations, it models AQI down to a 5-meter grid using station data, satellite, weather, and traffic inputs. The result: a walkable map that shows which side of the street is greener. Google Maps uses BreezoMeter for its own air quality overlay, so if you like that layer, BreezoMeter is where it comes from.
Where it falls short: modeled data is only as good as its inputs. In cities with sparse station networks, BreezoMeter can be confidently wrong. Also, since Google acquired the company in 2022, direct consumer apps have been in limbo.
Pricing:
- Free consumer app (where available)
- Enterprise API for developers
Platforms: Android (limited availability), iOS (limited), Web
Download: Web
Bottom line: great science, uncertain consumer future. Access via Google Maps’ air quality layer if the direct app isn’t available.
7. Airly — Best for European sensor density
Airly operates the largest privately-owned air quality sensor network in Europe, with thousands of sensors across Poland, the UK, Germany, and elsewhere. In Airly-dense cities, the map shows sensor coverage at almost every intersection. Alerts, historical trends, and pollution forecasts round out the app.
Where it falls short: coverage outside Europe is sparse (largely relies on official data there). US and Asian users will find IQAir or Air Matters more useful.
Pricing:
- Free tier: full core features
- Airly for Business: sensor rental for organizations
Platforms: Android, iOS
Download: Google Play
Bottom line: European users get the densest sensor grid here. Elsewhere, look at IQAir or AirCare.
How to pick
- Want the single default: IQAir AirVisual. Reliable, well-sourced, works anywhere.
- Live in wildfire country: AirCare, because community sensors will surface the hazard 20 minutes before the official station updates.
- Live in Europe: Airly, because the sensor density is unmatched.
- Track multiple cities: Air Matters, for the dashboard experience.
- Care about indoor air: Withings Home if you have the hardware, otherwise a smart-home hub like a Awair reader is a better route.
- Want the exact air you breathe: Plume Flow with the wearable. No app-only alternative matches personal-sensor accuracy.
FAQ
What is the best free air quality app for Android? IQAir AirVisual for global coverage, Air Matters for multi-city dashboards, or Airly if you live in Europe. All three are functional on their free tiers.
Do air quality apps actually help with asthma? Yes, if you set threshold notifications. The point isn’t the number, it’s the alert that lets you close windows or reschedule a run before a bad-air day escalates.
Can I trust community sensor data on PurpleAir and AirCare? Community sensors have variable calibration but are usually within a defensible range of official stations. The trade-off is coverage: three community sensors within a mile beat one official station 15 km away.
Does Google Maps show air quality? Yes, via BreezoMeter’s dataset, layered on Maps in supported regions. Look for the “Air quality” layer toggle.
What sensors do these apps use? Reference-grade government stations, community sensors (mostly PurpleAir), and — in Plume Flow and Withings’ case — the sensor built into their own hardware.
