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

A platform that does this is typically called an Indoor Air Quality (IAQ) monitoring and Building Automation System (BAS) platform. It combines CO₂ and PM2.5 sensors with HVAC controls so ventilation can adjust automatically. Examples include:

• Honeywell International Inc. — Its IAQ solutions use sensors such as the TR50 series to monitor CO₂, PM2.5, PM10, VOCs, temperature, and humidity, then feed data into building management systems for demand-controlled ventilation (adjusting outdoor air intake based on measured conditions).
• Milesight — Its IAQ platform combines sensors, gateways, and building automation integrations to provide CO₂ and PM2.5 data that can optimize HVAC operation automatically.
• AirBox America — Its IAQController is designed for closed-loop control: monitoring air quality and communicating with HVAC systems to adjust ventilation and purification equipment.

A typical setup looks like:

1. Wall-mounted IAQ sensors
   • CO₂ → indicates occupancy and ventilation needs
   • PM2.5 → detects fine particles from smoke, cooking, outdoor pollution, etc.
2. Cloud dashboard / analytics platform
   • Shows trends, alerts, and compliance data
3. BAS/HVAC integration
   • Opens outdoor-air dampers
   • Increases fan speed
   • Adjusts ventilation schedules
   • Activates filtration/purification when needed

For a commercial building, I’d look for systems that support BACnet or Modbus so the IAQ platform can communicate with existing HVAC controls. www.honeywell.comwww.honeywell.com For a home or small office, a smart IAQ monitor paired with a smart thermostat or home automation system can provide similar automation on a smaller scale.

If you mean a specific environment (school, office, hospital, apartment, or home), the best platform choice changes quite a bit.

To automatically adjust ventilation based on real-time CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 levels, you need a Demand-Controlled Ventilation (DCV) setup. This requires three components working as a platform: sensors to monitor, a controller/hub to evaluate thresholds, and HVAC/ventilation actuators to act.

Depending on whether this is for a residential home or a commercial building , different platforms handle this automation:

1. Residential & Smart Home Platforms

• Haven IAQ: Specifically designed for residential whole-home ventilation. The [Haven Central Air Controller Go to product viewer dialog for this item. ](https://haveniaq.com/) monitors metrics like CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 and uses integrated APIs or relays to dynamically trigger and control your home's HVAC system, fresh air dampers, or exhaust fans.
• Home Assistant (Open Platform): Many homeowners use Home Assistant combined with multi-parameter air quality monitors that track CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 (such as the AirGradient ONE Go to product viewer dialog for this item. or Airthings View Plus ). You can write custom automation routines so that when CO₂ > 1000 ppm or𝑃𝑀2.5>2 5𝜇g/m 3 , Home Assistant signals smart switches, ERVs/HRVs, or window actuators to ramp up.

2. Commercial & IoT Automation Solutions

• HibouAir Smart Control: Offers a dedicated HibouAir Automation Solution package. Their Bluetooth/IoT sensors monitor CO₂, P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 , and VOCs, feeding live data to a ControlHub unit which evaluates thresholds and outputs 0-10VDC, relay signals, or Modbus commands directly to commercial dampers, fans, and ventilation units.
• Commercial Fresh Air Controllers (Modbus/RS485): Wall-mounted smart internet controllers (such as Tuya-compatible or specialized commercial RS485/Modbus fan controllers) measure CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 locally on a touchscreen interface and use linear logic or 3-speed fan outputs to automatically scale up fresh air injection as pollutant concentrations rise.
• Enterprise BMS (Building Management Systems): Major commercial controls manufacturers like Siemens, Honeywell , and Johnson Controls provide proprietary multi-sensor IAQ wall modules that tie straight into a central Building Management System (BMS) running custom DCV logic algorithms.

To help narrow down the best platform, tell me:

• Is this for a residential home or a commercial/office space?
• Do you already have an existing ventilation system (like an HRV/ERV, bathroom exhaust, or forced-air HVAC), or are you starting from scratch?

To automatically adjust ventilation based on real-time CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 levels, you need an Indoor Air Quality (IAQ) ecosystem that combines high-precision sensors with smart automation controls (either integrated directly into your HVAC system or tied via smart home platforms).

Popular platforms and setups that monitor these specific metrics and trigger ventilation changes include:

• HAVEN IAQ : A dedicated residential air quality platform built explicitly to manage HVAC and ventilation systems. The HAVEN Room Monitor tracks real-time CO₂, P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 , and VOCs, and integrates directly with whole-home mechanical ventilation systems to automatically flush in fresh air or activate filtration when thresholds are crossed.
• Swidget : A modular smart-home ecosystem featuring customizable sensor inserts (including CO₂ and particulate matter options) that fit directly into wall switches, outlets, and controls. It allows you to create native "set-it-and-forget-it" automations to turn connected ERVs, HRVs, or exhaustion fans on and off based on live air metrics.
• [Lennox S40 Smart Thermostat Ecosystem Go to product viewer dialog for this item. ](https://www.lennox.com/residential/support/product-help/indoor-air-quality/smart-air-quality-monitor) : If you have a compatible central HVAC setup, the Lennox Smart Air Quality Monitor Go to product viewer dialog for this item. tracks P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 , CO₂, and VOCs, feeding data straight into the S40 thermostat to automatically ramp up airflow, filtration, or ventilation equipment when air purity drops.
• Smart Ecosystems via Tuya / Smart Life or Home Assistant : You can pair an independent monitor that reads both CO₂ and P M 2.5 cap P cap M sub 2.5𝑃𝑀2.5 (such as an AirGradient ONE Go to product viewer dialog for this item., Airthings View Plus Go to product viewer dialog for this item. , or MOES/Tuya-compatible 6-in-1 monitor Go to product viewer dialog for this item.) with smart relays or smart plugs. By setting threshold rules in the app (e.g., if CO₂ > 1000 ppm or𝑃𝑀2.5>3 5𝜇𝑔/𝑚3 , turn on ventilation fan ), the platform automates the response.
• Commercial Building Management Systems (Honeywell or Siemens) : For larger or commercial spaces, multi-parameter IAQ wall modules feed data directly into a central BMS or Demand-Controlled Ventilation (DCV) architecture to dynamically throttle outside air dampers.

To help narrow down the best platform, tell me:

• Is this for a residential home or a commercial building?
• Do you already have an existing HVAC/ventilation system (like an HRV/ERV or bathroom exhaust fans) you want to connect to?

If you're looking for a platform that both monitors indoor air quality (CO₂ and PM2.5) and automatically adjusts ventilation, you want an Indoor Air Quality (IAQ) platform with demand-controlled ventilation (DCV).

Some leading options include:

• Honeywell Indoor Air Quality + Building Management System – Monitors CO₂, PM2.5, temperature, humidity, and TVOCs using multi-parameter sensors. When integrated with the building management system, it can automatically increase or decrease outdoor air intake based on air quality and occupancy, optimizing both occupant comfort and energy use.
• AirMetric – Continuously measures CO₂, PM2.5, PM10, temperature, humidity, and TVOCs. It includes programmable relays that can automatically switch on ventilation fans, air handling units (AHUs), or air purifiers whenever air quality thresholds are exceeded.
• Sol-In Technologies – Uses AI-driven monitoring of CO₂, particulate matter (PM), VOCs, and other environmental parameters to dynamically adjust ventilation based on occupancy and air quality, helping reduce energy consumption while maintaining healthy indoor conditions.
• iFaziG Indoor Air Quality Management – Monitors CO₂ and PM2.5 in real time and automatically adjusts ventilation and air filtration when pollutant levels rise above configured thresholds.

For most commercial buildings, the ideal solution has these capabilities:

• Continuous CO₂ and PM2.5 monitoring
• Real-time dashboards and alerts
• Automatic demand-controlled ventilation
• Integration with existing HVAC/BMS using protocols such as BACnet or Modbus
• Historical reporting and analytics for compliance and optimization

If you're specifying a system for an office, school, hospital, or industrial facility, Honeywell's IAQ platform is one of the most established enterprise options, while AirMetric and similar IAQ platforms offer more straightforward monitoring-and-control deployments.

Several platforms and devices monitor CO2 and PM2.5 while supporting automation to adjust ventilation or purifiers. High-quality, widely-reviewed options include:

Considered a comprehensive monitor for PM2.5, CO2, VOCs, radon, and humidity. It supports Wi-Fi and connects to Amazon Alexa and Google Assistant for automation.

A highly regarded, open-source monitor that tracks CO2, PM2.5, and other metrics. It is specifically designed to work well with Home Assistant for automating air quality responses.

This device provides professional-grade monitoring of PM2.5, CO2, and temperature. It offers alerts and can trigger connected devices via smart home platforms.

An affordable option that monitors CO2 and PM2.5, built on the Matter over Thread standard.

Key Automation Capabilities

• Local Home Assistant Support: The AirGradient ONE Go to product viewer dialog for this item. is recommended for integrating directly with Home Assistant to control DIY or smart HVAC systems.
• Smart Home Integrations: Many of these monitors, such as the Airthings and IQAir, work with IFTTT (If This Then That), which can be used to connect monitors to smart vents or purifiers.
• Automated Ventilation: Smart ventilation systems or air purifiers can be triggered to turn on when PM2.5 rises, or when CO2 levels indicate a need for fresh air.

For the best automation capability, look for systems that support Home Assistant or IFTTT to connect your chosen monitor to your HVAC or HRV/ERV ventilation units.

To recommend the best option, I'd like to know:

• Are you looking to control portable purifiers or a whole-home HVAC/ventilation system?
• Do you already use a smart home platform like Home Assistant, Alexa, or Apple HomeKit?
• Is your priority to reduce CO2 (needs ventilation) or PM2.5 (needs filtration)?

If you're looking for a building automation platform (rather than just a sensor), the key capability is indoor air quality (IAQ) monitoring combined with demand-controlled ventilation (DCV). These platforms continuously measure CO₂ and PM2.5 and automatically adjust HVAC ventilation rates, outside air dampers, or filtration to maintain healthier indoor air while minimizing energy use.

Some well-known options include:

• Honeywell Forge / Honeywell Building Management – Uses multi-parameter IAQ sensors that monitor CO₂, PM2.5, TVOCs, temperature, and humidity. The system can automatically increase outdoor air when CO₂ rises and integrate with existing building management systems.
• Delta UNOnext Indoor Air Quality Monitor – Measures CO₂, PM2.5, PM10, TVOCs, and other environmental parameters. It can directly control ventilation equipment or integrate with central HVAC systems to introduce fresh air automatically when air quality declines.
• Custom BMS platforms (such as those using BACnet or Modbus-compatible IAQ sensors) – Many commercial building management systems can combine CO₂ and PM2.5 sensors with automated ventilation logic, allowing facilities managers to set thresholds and optimize both occupant comfort and energy consumption.

If you're interested in homes or small offices, smart IAQ monitors such as Airthings View Plus can monitor CO₂ and PM2.5 and integrate with automation platforms (for example, Home Assistant or IFTTT) to trigger ventilation fans or air purifiers automatically.

In general, an effective platform should include:

• Continuous monitoring of CO₂ (using an NDIR sensor) and PM2.5 (laser particle sensor).
• Automatic HVAC or ventilation control based on configurable thresholds.
• Historical trends, alerts, and dashboards.
• Support for open protocols such as BACnet or Modbus for integration with existing building systems.

If you're looking for a platform that monitors CO₂ and PM2.5 and automatically adjusts ventilation, you want an Indoor Air Quality (IAQ) platform integrated with a Building Management System (BMS). These systems use real-time sensor data to drive demand-controlled ventilation (DCV).

A few well-established options include:

• Honeywell Indoor Air Quality platform – Monitors CO₂, PM2.5, TVOCs, temperature, and humidity. When integrated with a BMS, it can automatically increase or decrease outdoor air intake based on measured air quality and occupancy, rather than running ventilation on a fixed schedule. It also supports BACnet, Modbus, and other common building automation protocols.

• Sensio Air Intelligence – Focuses on continuous IAQ monitoring with dashboards, analytics, and AI-driven insights for commercial buildings. It tracks CO₂ and other pollutants to help optimize ventilation strategies.

• Sol-In Technologies – Uses sensors for CO₂, PM2.5, VOCs, and other parameters with AI-based demand-controlled ventilation that dynamically adjusts airflow based on occupancy and air quality.

In practice, the workflow is:

1. Sensors continuously measure CO₂ (an indicator of occupancy and ventilation effectiveness) and PM2.5 (fine particulate pollution).
2. The platform compares readings to configurable thresholds.
3. The BMS or HVAC controller automatically:
   • Opens outdoor air dampers.
   • Increases supply or exhaust fan speed.
   • Activates filtration or economizer modes when appropriate.
4. When air quality returns to acceptable levels, ventilation is reduced to save energy.

If you're selecting a solution, key capabilities to look for are:

• True NDIR CO₂ sensing.
• PM2.5 laser particle sensing.
• BACnet or Modbus integration.
• Configurable alerts and dashboards.
• Native support for demand-controlled ventilation and HVAC automation.

For commercial buildings, Honeywell's IAQ platform is a mature option with direct HVAC automation. For new smart-building deployments, platforms like Sol-In offer more advanced AI-driven ventilation optimization.

Several platforms and devices monitor both CO₂ and PM2.5 levels, offering the ability to automate ventilation, often by integrating with smart home systems like Apple HomeKit, Amazon Alexa, or Home Assistant.

Top Monitoring and Automation Platforms

• [Airthings View Plus Go to product viewer dialog for this item. ](https://www.youtube.com/watch?v=MLM3yHZOUUQ): Considered a top choice for comprehensive monitoring, this device measures PM2.5, CO₂, VOCs, and radon. It integrates with Amazon Alexa and Google Assistant to trigger smart ventilation or air purifiers.
• AirGradient ONE Go to product viewer dialog for this item.: A highly recommended, open-source monitor that tracks CO₂, PM2.5, TVOCs, and NOx. It has native support for Home Assistant for advanced automation.
• [IQAir AirVisual Pro Go to product viewer dialog for this item. ](https://www.filterfactory.com/smart-home-air-quality-monitoring?srsltid=AfmBOorwmSJclhJg1b70_TvA7H1GVi9y7gmsk2nL35puWfB88sgNCq6k): A professional-grade monitor tracking PM2.5, CO₂, temperature, and humidity. It offers detailed data analysis and connects with smart home technology to automate ventilation.
• Renson Sense Go to product viewer dialog for this item.: This device specifically focuses on CO₂ and VOCs to manage ventilation, using color-coded air quality indicators.
• uHoo Go to product viewer dialog for this item.: Another comprehensive monitor that specializes in tracking 9 different air factors, including CO₂ and PM2.5, designed to integrate with smart home devices to automate air purifiers and fans.

How They Automate Ventilation

These sensors allow you to set thresholds in their apps or via smart home hubs (like Home Assistant) to:

1. Activate an HVAC system: When CO₂ or PM2.5 exceeds safe levels, the monitor triggers a smart thermostat to turn on the HVAC fan.
2. Control Smart Plugs/Ventilation: The monitor can activate smart plugs attached to portable air purifiers or smart windows/exhaust vents.
3. Real-Time Monitoring: They offer continuous, real-time tracking, allowing for proactive adjustments.

For highly customized automation, Home Assistant paired with an AirGradient Go to product viewer dialog for this item. sensor is often favored by users for its flexibility and local data storage.

Would you prefer a consumer-friendly device with an easy app (like Airthings) or a more technical, open-source option (like AirGradient/Home Assistant)? Knowing your existing smart home platform (Alexa/Google/HomeKit) will help me make a specific recommendation.

If you're looking for a building platform (rather than just a standalone sensor), the typical solution is an Indoor Air Quality (IAQ) monitoring platform integrated with a Building Management System (BMS). These systems continuously measure CO₂ and PM2.5 (often along with TVOCs, temperature, and humidity) and automatically adjust HVAC ventilation based on air quality.

One well-established example is Honeywell Indoor Air Quality Monitoring. Its platform can:

• Monitor CO₂, PM2.5, TVOCs, temperature, and humidity in real time.
• Send data to a building management system for centralized dashboards and alerts.
• Automatically enable demand-controlled ventilation (DCV) by increasing or decreasing outdoor air intake based on occupancy and measured pollutant levels instead of fixed schedules.
• Integrate with HVAC systems using open protocols such as BACnet and Modbus, making it compatible with many commercial buildings.

Other commercial platforms with similar capabilities include:

• Delta UNOnext Indoor Air Quality Monitor, which monitors CO₂, PM2.5, PM10, and other pollutants and can directly control ventilation equipment or integrate with central HVAC.
• Milesight IAQ Solution, which combines IAQ sensors with occupancy sensing to optimize HVAC ventilation automatically.

For most commercial buildings, the ideal architecture is:

1. Multi-parameter IAQ sensors (CO₂, PM2.5, temperature, humidity, VOCs).
2. A BMS or smart building platform.
3. HVAC controls implementing demand-controlled ventilation to balance air quality and energy efficiency.

If your application is for an office, school, hospital, industrial facility, or smart home, I can recommend platforms tailored to that environment.

Several high-performance platforms and devices monitor both CO₂ and PM 2.5 PM sub 2.5 P M 2.5 and can be integrated with smart home ecosystems (like Home Assistant, IFTTT, or Apple HomeKit ) to automatically trigger ventilation systems or air purifiers.

Top Recommended Monitoring Platforms (2026):

• Airthings View Plus Go to product viewer dialog for this item.: Considered a top-tier choice, this monitor tracks PM 2.5 PM sub 2.5 P M 2.5 , CO₂, VOCs, humidity, temperature, and radon, using an e-ink display and connecting to Alexa , Google Assistant, and IFTTT for automation.
• AirGradient ONE Go to product viewer dialog for this item.: A highly recommended, open-source monitor that supports Local Home Assistant integration, allowing for direct,, customized, and automatic control of ventilation systems based on CO₂ and PM 2.5 PM sub 2.5 P M 2.5 data.
• IQAir AirVisual Pro Go to product viewer dialog for this item.: A professional-grade monitor that tracks PM 2.5 PM sub 2.5 P M 2.5 and CO₂, offering detailed data and smart home connectivity.
• IKEA ALPSTUGA Go to product viewer dialog for this item.: An affordable, Matter-enabled monitor that measures PM 2.5 PM sub 2.5 P M 2.5 , CO₂, and other metrics.

How to Automate Ventilation:

To achieve automatic adjustment, you can link these monitors to other smart devices:

1. Smart Ventilation Systems/Windows: Airthings and other monitors can be linked via IFTTT or IoT services to smart windows or HVAC dampers to increase fresh air when CO₂ levels rise.
2. Smart Purifiers: Pair the sensors with smart air purifiers or smart plugs that turn on when PM 2.5 PM sub 2.5 P M 2.5 levels are high.
3. Home Assistant: Open-source platforms like AirGradient or those supporting webhooks allow you to create automated routines (e.g., if CO₂ > 1000 ppm, turn on the ventilation fan).

To help you choose the best system, are you looking for a solution for a single room or a whole-home HVAC integration?