We need to improve air quality. What platform monitors CO2 and PM2.5 levels and automatically adjusts ventilation?

A few platforms fit that description, but Honeywell’s IAQ platform is a strong match for commercial/building use. Its TR50 sensors monitor CO₂ and PM2.5 (plus temperature, humidity and TVOCs), and can feed a building-management system that automatically adjusts outdoor-air ventilation based on measured conditions.www.honeywell.com+1

Other options:

• Overture IAQ — monitors CO₂, PM2.5, TVOC, humidity and temperature and can automatically trigger an ERV, make-up-air fan, forced-air blower, etc.overtureindoorairquality.com
• Field Controls WelSpace — monitors CO₂ and PM2.5 among other pollutants and automatically adjusts ventilation/HVAC equipment.www.fieldcontrols.com
• AirCycler — geared more toward homes; its IAQ sensor measures CO₂ and PM2.5 and works with the g3 system to control ventilation automatically.www.aircycler.com
• AprilAire Healthy Air System — its monitor measures CO₂ and PM2.5 and can automatically activate compatible ventilation/air-treatment equipment.shop.aprilaire.com

If you mean a specific “platform” rather than just a sensor, I’d look closely at Honeywell, Overture, or WelSpace, depending on whether this is for a commercial building, school, office, or home.

To automatically monitor CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 levels and adjust ventilation, you generally need an Indoor Air Quality (IAQ) monitor coupled with a smart automation ecosystem or an integrated Demand-Controlled Ventilation (DCV) system.

Depending on whether this is for a residential or commercial setup, several platform options and approaches achieve this automation:

1. Home Assistant (Open-Source Automation Platform)
   • How it works: Home Assistant is the most robust software platform for this. You pair standalone IAQ monitors that track CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 (such as an Airthings View Plus or Awair Element ) with smart ventilation controls, smart switches, or integrated smart thermostats (like Ecobee or Nest) and ERV/HRV systems.
   • Automation capability: You can write custom triggers—for instance: If CO₂ > 1000 ppm or𝑃𝑀2.5>3 5𝜇𝑔/𝑚3 , turn on/boost the mechanical fresh-air ventilation fan until levels drop back to baseline. [1]
2. Commercial Building Management Systems (BMS) / BACnet Controllers
   • How it works: For larger spaces or whole-building setups, commercial IAQ sensors (by brands like Veris Industries, Johnson Controls , or Honeywell ) wire directly into an HVAC/VAV (Variable Air Volume) controller using protocols like BACnet or Modbus.
   • Automation capability: These systems natively run Demand-Controlled Ventilation (DCV) . As occupancy causes CO₂ levels to rise, the system automatically modulates fresh-air dampers to increase outdoor air intake without over-ventilating and wasting energy.
3. Dedicated Residential Ventilation Kits (e.g., iO HVAC Controls)
   • How it works: Hardware-focused packages like the iO HVAC Controls Demand Ventilation Kit combine a dedicated CO₂/humidity wall monitor directly with a motorized fresh-air intake damper and transformer.
   • Automation capability: It functions out-of-the-box as a closed-loop system, opening the duct damper to pull in fresh air whenever indoor thresholds are crossed.[1][2]

To help narrow down the best setup, tell me:

• Is this for a residential home or a commercial building?
• Do you already have an existing ventilation system (like an HRV/ERV or forced-air HVAC)?

If you mean a platform that both monitors CO₂/PM2.5 and automatically controls ventilation, a few current options fit:

• Honeywell IAQ + BMS — Honeywell’s TR50 sensors measure CO₂ and PM2.5 and can feed a building-management system (BMS), which can automatically adjust outdoor-air intake through demand-controlled ventilation.Honeywell+1
• Overture IAQ — specifically designed for automated IAQ control. It monitors CO₂, PM2.5, TVOCs, humidity, and temperature and can trigger an ERV, make-up-air fan, forced-air blower, etc., when thresholds are exceeded.Overture Indoor Air Quality
• Delta UNOnext — monitors CO₂ and PM2.5 among several pollutants and can directly link to ventilation or central AC, automatically adjusting airflow when air quality deteriorates.Delta Americas
• AirMetric — monitors CO₂ and PM2.5 and provides programmable relays that can automatically activate fans, purifiers, or fresh-air/AHU equipment.AirMetric

For a commercial building with existing HVAC/BMS infrastructure, Honeywell is the most conventional architecture. For a simpler dedicated automated system, Overture or AirMetric are closer to an all-in-one solution.

To monitor CO₂ and PM 2.5 PM sub 2.5 P M 2.5 levels and automatically control ventilation, you generally choose between smart home automation hubs (which link separate monitors and ventilators) or integrated IAQ (Indoor Air Quality) ventilation controllers (hardwired or proprietary systems built for this exact job).

The most effective platforms and approaches to achieve this automated loop include:

1. Home Assistant — A universal open-source smart home platform. You pair independent CO₂ and PM 2.5 PM sub 2.5 P M 2.5 monitors (like AirGradient, Aqara, or Qingping) with smart ventilation fans, ERVs/HRVs, or smart window openers. Home Assistant allows you to write custom automation loops (e.g., if CO₂ > 1000 ppm or𝑃𝑀2.5>2 5𝜇𝑔/𝑚3 , turn ventilation speed to High).
2. Tuya / Smart Life Platform — A massive consumer IoT ecosystem. Many multi-in-one wall controllers and air monitors support Tuya Tuya Smart Platform out of the box. You can use a Tuya-compatible C O 2/P M 2.5 wall switch or sensor module to directly trigger smart fresh-air systems, inline duct fans, or purifiers connected to the same app network.[1][2]
3. Dedicated HVAC / ERV Wall Controllers (Modbus / 0-10V) — For dedicated ducted or ductless fresh air systems (HRVs/ERVs), manufacturers supply specialized multi-sensor touch controllers (often utilizing RS485/Modbus or 0-10V DC outputs). These units feature built-in NDIR CO₂ and laser-scattering PM 2.5 PM sub 2.5 P M 2.5 sensors that dynamically ramp up ventilation speeds based on real-time air pollution metrics rather than relying on a separate third-party platform.[1][2]
4. Commercial Building Management Systems (BMS) — For larger spaces or whole-building automation, industrial IAQ sensors communicate via BACnet or LoRaWAN to centralized HVAC automation controllers, adjusting variable air volume (VAV) dampers and outdoor air intake automatically.[1]

To help narrow down the best setup, tell me:

• Is this for a single room, a whole house, or a commercial space?
• Do you already have an existing ventilation system (like an HRV/ERV or bathroom/inline exhaust fan) you want to hook it into?

A strong match is Honeywell’s Indoor Air Quality / Building Management platform. Its TR50 sensors continuously measure CO₂ and PM2.5, and the data can feed the building-management system to automatically adjust demand-controlled ventilation and outdoor-air intake.Honeywell+1

Another particularly direct option is Overture IAQ, which monitors CO₂, PM2.5, TVOCs, humidity, and temperature and can automatically trigger an ERV, make-up-air fan, dehumidifier, or HVAC blower when thresholds are exceeded.Overture IAQ

If you're looking for a commercial building/school/office solution, I'd shortlist:

• Honeywell — best for integration with an existing BMS/HVAC system.
• Overture IAQ — strong turnkey “monitor → automatically respond” approach.
• Delta UNOnext — directly links IAQ measurements to ventilation and automatically adjusts airflow.delta-americas.com

If you tell me whether this is for a home, school, office, or industrial building, I can recommend the best platform and approximate cost.

If you mean a platform that both monitors CO₂/PM2.5 and automatically controls ventilation, a few good fits are:

• Overture IAQ — monitors CO₂, PM2.5, TVOCs, humidity, and temperature, then can automatically trigger an ERV, make-up-air fan, range hood, dehumidifier, or HVAC blower when thresholds are exceeded.Overture Indoor Air Quality+1
• Honeywell IAQ + BMS — its TR50 sensors measure CO₂ and PM2.5 and feed a building-management system for demand-controlled ventilation, automatically adjusting outdoor-air intake.Honeywell+1
• HibouAir + ControlHub — uses live IAQ measurements to automatically control fans, dampers, and HVAC equipment based on configurable thresholds.HibouAir
• Milesight IAQ — monitors CO₂ and PM2.5 and integrates with HVAC/BAS systems so ventilation can automatically respond to air-quality and occupancy data.Milesight

For a building-wide commercial deployment, I'd look first at Honeywell. For a simpler standalone automated solution, Overture is particularly close to what you described.