Terrestream Smart Indoor Air Quality Monitor featuring App, CO2 & PM2.5

Check indoor readings alongside outdoor air quality, smoke, pollen and weather. Get suggestions for ventilation, particle filtering and natural cooling. Mobile app and web dashboard. Check the room from your phone, get a heads-up when conditions change, and compare indoor readings with available outdoor context before deciding what to do. Current room readings and alerts • Practical ventilation and filtration guidance • Recent charts that show what happened next • More rooms as you add monitors. Terrestream mobile app available for iOS and Android. Apple Watch has require a compatible watch and paired iPhone. See when bedroom CO₂ builds and whether it clears. Check outdoor conditions before airing the room in the morning. Dim the screen and light ring for sleep. Cooking can raise CO₂ and particles. Keep a vented hood running and watch both readings, so you know when they return toward their earlier levels. Compare indoor temperature and humidity with the outdoor forecast before opening up. On a suitable evening, fresh air may let you give the AC a break. Check whether outdoor conditions favor opening a window for fresh air. If not, open an interior door and use a fan to move air through the space. Follow humidity and temperature in a basement, laundry room or any room at home. Check current readings and recent trends in the app. About 4.37 inches tall, with a 2.72 × 2.56 inch footprint. Plug it into USB-C power to keep your room readings in view. Indoor signals Six sensors provide 12 indoor signals: CO₂; PM1.0, PM2.5, PM4.0 and PM10; VOC and NOx indices; temperature, humidity, pressure, light and IAQ. Installed sensing components Sensirion SEN66 multi-parameter air-quality module; Bosch BMP390L pressure sensor; Texas Instruments OPT3001 ambient-light sensor. CO₂ sensor accuracy Factory-calibrated sensor: ±(50 ppm + 2.5% of reading) at 400–1,000 ppm under specified sensor test conditions. Accuracy varies by range, operating conditions and metric. Outdoor context Outdoor air quality, smoke, pollen, ozone, UV and weather data from external services; traffic-related pollution context where available. Coverage and freshness vary by location and source. Display and controls 3.5-inch color touchscreen and color-changing status ring. Screen brightness, ring brightness and volume adjust separately. Quiet Hours dim the screen and ring and suppress device notifications. Charts and history Recent web charts cover 24 hours, 7 days and 30 days. Up to 90 days of retained history are included, subject to privacy settings. Power and network Continuous USB‑C power; no battery. Live on-device readings work without Wi‑Fi or an account. Connected has need 2.4 GHz Wi‑Fi, internet and an account. In the box Terrestream monitor, USB‑C power adapter, USB‑C cable and printed How to Breathe guide. Size and weight 69 × 65 × 111 mm; approximately 2.72 × 2.56 × 4.37 inches. Device weight: 6.7 oz. Model: TSR50035DAI. Local connections Home Assistant discovery and MQTT with your own broker and compatible setup. Appliance control requires separately configured automation. Measurement limits VOC and NOx are relative indices, not identification of individual chemicals. The device does not identify indoor pollen, measure carbon monoxide or radon, or replace safety alarms or specialist tests. Alexa connection Compatible with Alexa through the Terrestream skill. Ask for supported readings and create routines. Requires 2.4 GHz Wi-Fi, internet, cloud sync and a verified Terrestream account that owns the sensor. United States; Alexa in English (US). No Terrestream subscription required. What is included with the app? Current readings, charts, core recommendations and standard notifications are included with the monitor. The mobile app is available for iOS and Android; the web dashboard shows recent history. Connected has need internet and an account. Can I use it without Wi‑Fi? Yes. With USB‑C power, the monitor shows live readings without Wi‑Fi or an account. Outdoor context, app alerts and connected history require 2.4 GHz Wi‑Fi, internet and an account. Is Terrestream compatible with Alexa? Yes. Enable the Terrestream skill, link your account and choose your sensors. Ask for readings or create routines. Requires internet and cloud sync. US English, United States only. No Terrestream subscription required. What do the particle and gas readings measure? Particle readings show particulate matter levels but do not identify individual particle types. VOC and NOx are relative indices and do not identify individual chemicals. Outdoor pollen information comes from external data sources. Does it replace a smoke, carbon monoxide or radon alarm? No. Terrestream is an indoor air monitor, not a safety alarm or medical device. It does not measure carbon monoxide or radon. Keep required alarms and specialist testing in place. Know when to open a window. See what changes at home. See the overnight CO₂ pattern. See when cooking air clears. Plan fresh air.