The AQI is 95.
Should you be outside?

Actionable advice tailored to you. Not just a blurry index.

Free with a sensor on your own network.

The Be I/O tab reading Be Inside. 19.3 µg/m³ against a 15 µg/m³ guideline, and a bar in which one hard hour of running takes 117 µg of the day's 303. — **Be Inside.** 28.9 µg/m³ out, and an hour flat out.

The same tab reading Be Outside. 12.5 µg/m³ against the same guideline, from a gentler day in cleaner air. — **Be Outside.** Same screen, an easy 45 minutes in 20 µg/m³.

The Air tab: 28.9 µg/m³ from a sensor called Back Deck, a week of history behind it, and an indoor estimate of 14.4 µg/m³ under a slider for how much gets in. — **The air.** Where the reading came from, and what it means indoors.

One run: 130 µg taken in, the route on a map with the monitors that spoke for it, and breathing and air charted minute by minute. — **Afterwards.** What the run actually cost.

It answers

Not a number and a shrug. A verdict for the day you’re planning: how long you’ll be out, and how hard.

Your sensors first

A PurpleAir or AirGradient on your network is read directly by your phone. No sensor of your own? Be I/O finds the nearest public monitor.

It shows its work

Every number is broken down so you understand the impact of each part.

An hour of running can cost more than a day sitting

You breathe about ten times as much air running hard as you do at rest, and less when you’re sleeping. A concentration on its own knows nothing about that.

Be I/O estimates the impact of air quality on you based on the day you’re actually planning.

What it costs

Your own sensors, on your own network, are free forever — no account, nothing leaving the house. The subscription pays for the servers everything else runs through.

Feature	Free	Subscription
Your own sensors, over your own network	✓	✓
Your planned activities and estimated breathing rates	✓	✓
The reading, the indoor estimate, the verdict	✓	✓
Your own sensors when you’re away from home		✓
The nearest public monitor, wherever you are		✓
A week of sensor history		✓
Last 30 days of activites and what they cost you		✓
The watch app		✓