Breathe Better. Live Smarter.^®

Indoor air finally becomes actionable.

Know what changed. Know what to do. Terrestream Intelligence connects indoor readings, outdoor air, weather, pollen, smoke, room history, and source patterns into plain-English recommendations.

Try a live scenario Explore the analytics

Status Moderate

Current driver CO2

Confidence 86%

Lens Office

IAQ AQI

CO2 ppm

612

PM2.5 µg/m³

7.4

VOC index

Web app, mobile app, AI interpretation, and local integrations working together.

Actionable Intelligence

The point is not more data. The point is better decisions.

Terrestream combines your room data with external environmental feeds, then explains the result in careful language: what changed, why it may have happened, and what options are worth considering.

Indoor sensor

1,280 ppm CO2

CO2, PM2.5, PM10, VOC, NOx, temperature, humidity, pressure, and light.

Outdoor context

38 AQI

Weather, AQI, pollen, smoke, location, climate, and public data feeds.

Room history

5 nights/wk

Baselines, recurring events, recovery curves, seasonal shifts, and comparisons.

AI synthesis

1 trial

Pattern detection, plain-language interpretation, and careful suggestions to consider.

Scenario synthesis

Office CO2 buildup

Today View

A calm command center for the room you are in.

The Today dashboard starts with the answer people need first: is the indoor environment okay right now, what is happening outside, and what might happen next?

Attractive local map with current outdoor context.
Easy overview status for the room and device.
Twelve compact gauges for indoor signals plus weather and five-day outlook.
Below the fold: readings, interpretations, notifications, trends, and useful environmental context.

See the full analytics

Outdoor context is fused from named, authoritative sources: Open-Meteo weather, Google Air Quality (US EPA AQI), Google Pollen, and NOAA HMS / NASA FIRMS smoke. See the data sources →

Outdoor context · live Columbus, OH Storm · outdoor AQI 38 · pollen Low

Outdoor AQI 38

Weather 88°F

Indoor IAQ 42

Wind 12 mph

Now+6h+12h+18h+24h

Indoor readings are weighed against live weather, outdoor air, pollen, and smoke so the dashboard can tell inside sources from outside ones.

IAQ AQI

CO2 ppm

612

PM2.5 µg/m³

7.4

VOC index

NOx index

Temp °F

RH %

Outlook day

Dashboard View

Sophisticated analytics without the spreadsheet feeling.

The dashboard is alive: animated, interactive, colorful, and built around meaning. Apache ECharts powers dense analytical views, but the user sees interpretations instead of a data dump.

Current driver CO2 Office · 1,280 ppm

Confidence 86% pattern match

Suggested lens Office overnight recovery

Every metric on one comparable scale - see at a glance which one is actually driving the room.

The whole-room fingerprint, every signal at a glance.

Where each pollutant came from: this room, outside, or a recurring pattern.

live signals 12

Live gauges

Right-now status, breakpoint colors, comfort bands, and current weather.

rolling traces 12 hr

Time series

Cooking spikes, overnight CO2 buildup, recovery after ventilation, and repeating schedules.

forecast layer 5 day

Maps and outlooks

Local weather, outdoor air, pollen, smoke, and environmental outlooks.

ECharts views 40+

Advanced charts

Distributions, heatmaps, comparisons, correlations, and event timelines.

plain language AI

Interpretations

Readable summaries that explain what changed, likely causes, and what to watch next.

not noise signal

Notifications

Useful alerts when the data suggests a room deserves attention.

Signature view

How the air’s makeup shifts across the day

Not a line dashboard. A flowing composition of every metric at once, so the story of a day—a quiet morning, a cooking spike, an evening recovery—reads in a single glance.

Indoor vs. outdoor vs. history — the source breakdown.

How much faster a room clears when you act.

Your repeating patterns, by day and hour.

What’s you versus what’s the world outside.

Annual view Year in Air Home · January to December

Year in one breath

Your cleanest stretch came after the spring filter change. Summer smoke events were visible, but the home recovered faster than last year.

Example Year in Air artifact. Generated from daily and hourly rollups.

Annual view

A year of air, summarized.

Year in Air turns long-term history into a simple annual view: steady days, notable patterns, outdoor events, and a short note written from validated facts.

Daily signatureA 365-day fingerprint of indoor air and outdoor context.
Notable patternsThe months, stretches, and recovery days that stood out.
Annual noteA short summary written from validated facts. No invented numbers.

Forty-plus visualization types, from gauges to distributions to correlations, all surfaced as interpretations instead of a data dump. The advantage is synthesis: your sensor plus high-quality external feeds, brought together so sources, weather, and repeating patterns are easy to read.

Data First

Your readings are not trapped in our interface.

Terrestream is built for people who want the dashboard and the underlying data. Export your history whenever you want, in useful shapes, with the range and metrics you choose.

CSV
JSON
wide tables
long tables
date ranges
room slices
metric subsets
comparison windows

Integrations

Local-first where it matters.

The device itself speaks to the systems many serious smart-home users already trust. No app or subscription is required for the core local integrations.

Home Assistant
MQTT

Home Assistant, MQTT, and the local HTTP API run from the device. Matter support is available through Home Assistant's Matter bridge for Apple Home, Google Home, and other Matter-compatible platforms.

Local

Home Assistant sees every signal.

Auto-discovered entities for CO₂, PM, VOC, NOₓ, comfort, pressure, and light without waiting on cloud automation.

Open

MQTT and local HTTP for your stack.

Publish readings to your own broker, Node-RED flow, OpenHAB dashboard, database, or monitoring pipeline.

Bridge

Matter through Home Assistant.

Expose the readings into Apple Home, Google Home, Alexa, and SmartThings through the Home Assistant Matter bridge.

Mobile App

The same intelligence, designed for your pocket.

The mobile app brings much of the web dashboard experience to iOS and Android: status, trends, alerts, AI interpretation, machine-learning pattern detection, and practical suggestions when the air changes.

Web remains the flagship analytical surface; mobile is the faster daily companion.

Included vs Pro

The essential experience is included. Pro adds depth.

The $249 USD sensor includes the web dashboard, local integrations, recent history, export, external data context, and basic AI recommendations. Pro is for people who want longer memory, deeper pattern detection, and more advanced household intelligence.

Included

Dashboard fundamentals

Live dashboard, recent history, exports, weather/AQI/pollen/smoke context, basic AI insight cards, local API, MQTT, and Home Assistant.

Pro

Deeper intelligence

Unlimited history, long-range comparisons, Family Circle, advanced pattern detection, recurring-event explanations, wellbeing/pet/sleep lenses, and advanced notifications.

Compare plans Meet the sensor

Breathe Better. Live Smarter.

Turn every reading into a next step.

One sensor. Twelve signals. Indoor readings connected to outdoor context and plain-English recommendations. Use Terrestream Intelligence to understand what changed, why it matters, and what to do next.

$249 USD one-time

Buy Terrestream See pricing

No subscription required
30-day returns
1-year limited warranty
Fast shipping via FedEx

Six sensors. Twelve signals.

Built on genuine Sensirion, Bosch, and Texas Instruments sensors.

CO₂
IAQ
VOC
NOₓ
PM1
PM2.5
PM4
PM10
Temperature
Humidity
Pressure
Light

Included

In the box: the sensor, USB-C cable, power adapter, and printed field guide
Dashboard and mobile app included
Privacy-first air data

Works with

Home Assistant
MQTT