Brief
Airflow Explained: CFM, Liters per Second, CADR, and Room Size
Practical guide to Airflow Explained: CFM, Liters per Second, CADR, and Room Size, with decision checks, caveats, and sources.
Coverage Index
Articles, explainers, and update notes.
Article archive for filtration, monitoring, standards, pilots, and industrial indoor-air-quality developments.
Latest publication
Air Cleaner Buying Fields Worth Capturing in a Product Database
Practical guide to Air Cleaner Buying Fields Worth Capturing in a Product Database, with decision checks, caveats, and sources.
Brief
ASHRAE 241 Basics for Homeowners and Small Offices
Practical guide to ASHRAE 241 Basics for Homeowners and Small Offices, with decision checks, caveats, and sources.
Brief
Classroom CO2 Readings: How to Interpret Them Without Overclaiming
Practical guide to Classroom CO2 Readings: How to Interpret Them Without Overclaiming, with decision checks, caveats, and sources.
Brief
CO2 Data Logging: What a Useful Indoor Air Dashboard Should Capture
A decision-focused guide to CO2 Data Logging: What a Useful Indoor Air Dashboard Should Capture.
Brief
CO2 Filters vs. Air Cleaners: What Indoor Air Devices Can and Cannot Do
A source-backed guide to the difference between particle filtration, ventilation, CO2 monitoring, and emerging carbon-capture devices for indoor air.
Brief
CO2 Guidelines and Evidence Quality: Why Simple Cutoffs Are Tricky
Practical guide to CO2 Guidelines and Evidence Quality: Why Simple Cutoffs Are Tricky, with decision checks, caveats, and sources.
Brief
CO2 Monitor Calibration: Drift, Fresh-Air Checks, and Data Trust
A decision-focused guide to CO2 Monitor Calibration: Drift, Fresh-Air Checks, and Data Trust.
Brief
Where to Place a CO2 Monitor: Rooms, Height, Distance, and Common Mistakes
Practical guide to Where to Place a CO2 Monitor: Rooms, Height, Distance, and Common Mistakes, with decision checks, caveats, and sources.
Brief
Is There a Consumer CO2 Removal Market Yet? A Reality Check
Practical guide to Is There a Consumer CO2 Removal Market Yet? A Reality Check, with decision checks, caveats, and sources.
Brief
CO2 Sensors vs. Air Purifiers: Different Tools for Different Problems
Practical guide to CO2 Sensors vs. Air Purifiers: Different Tools for Different Problems, with decision checks, caveats, and sources.
Brief
CO2 Thresholds Indoors: A Careful Guide to What Numbers Can and Cannot Prove
Practical guide to CO2 Thresholds Indoors: A Careful Guide to What Numbers Can and Cannot Prove, with decision checks, caveats, and sources.
Brief
Demand-Controlled Ventilation and CO2: What the Sensor Is Actually Controlling
A decision-focused guide to Demand-Controlled Ventilation and CO2: What the Sensor Is Actually Controlling.
Brief
Direct Air Capture vs. Room Air Cleaning: Why the Technologies Are Not the Same
Practical guide to Direct Air Capture vs. Room Air Cleaning: Why the Technologies Are Not the Same, with decision checks, caveats, and sources.
Brief
Filter Fit and Air Bypass: Why HVAC Filter Installation Matters
Practical guide to Filter Fit and Air Bypass: Why HVAC Filter Installation Matters, with decision checks, caveats, and sources.
Brief
Heat Recovery Ventilation Basics: Clean Outdoor Air Without Ignoring Energy
A decision-focused guide to Heat Recovery Ventilation Basics: Clean Outdoor Air Without Ignoring Energy.
Brief
HEPA Filtration vs. Ventilation: What Each One Actually Changes Indoors
Practical guide to HEPA Filtration vs. Ventilation: What Each One Actually Changes Indoors, with decision checks, caveats, and sources.
Brief
HVAC Filter Upgrades: Benefits, Pressure Drop, Fit, and System Limits
Practical guide to HVAC Filter Upgrades: Benefits, Pressure Drop, Fit, and System Limits, with decision checks, caveats, and sources.
Brief
The Indoor Air Quality Metric Stack: CO2, Particles, Ventilation, and Source Control
Practical guide to The Indoor Air Quality Metric Stack: CO2, Particles, Ventilation, and Source Control, with decision checks, caveats, and sources.
Brief
MERV 13 Filter Upgrades: Evidence, Fit, Pressure Drop, and HVAC Tradeoffs
A decision-focused guide to MERV 13 Filter Upgrades: Evidence, Fit, Pressure Drop, and HVAC Tradeoffs.
Brief
A Practical Office Air Cleaning Plan Built Around Evidence Limits
Practical guide to A Practical Office Air Cleaning Plan Built Around Evidence Limits, with decision checks, caveats, and sources.
Brief
Particle Filter Ratings: What They Say and What They Leave Out
Practical guide to Particle Filter Ratings: What They Say and What They Leave Out, with decision checks, caveats, and sources.
Brief
Portable Air Cleaner Limits: Particles, Gases, CO2, and What Claims to Ignore
Practical guide to Portable Air Cleaner Limits: Particles, Gases, CO2, and What Claims to Ignore, with decision checks, caveats, and sources.
Brief
School Ventilation Standards: How CO2, Ventilation, Filtration, and Occupancy Fit Together
A decision-focused guide to School Ventilation Standards: How CO2, Ventilation, Filtration, and Occupancy Fit Together.
Brief
Source Control, Ventilation, and Air Cleaning: The Order Matters
Practical guide to Source Control, Ventilation, and Air Cleaning: The Order Matters, with decision checks, caveats, and sources.
Brief
Why Ventilation Comes First When CO2 Is the Concern
Practical guide to Why Ventilation Comes First When CO2 Is the Concern, with decision checks, caveats, and sources.
Brief
What to Watch This Week in CO2 Monitoring and Indoor Air Quality
Practical guide to What to Watch This Week in CO2 Monitoring and Indoor Air Quality, with decision checks, caveats, and sources.
Brief
Upper-Room UVGI vs. Filtration: Different Tools for Airborne Risk Reduction
Practical guide to Upper-Room UVGI vs. Filtration: Different Tools for Airborne Risk Reduction, with decision checks, caveats, and sources.
Brief
VOCs vs. CO2 Indoors: Why One Sensor Cannot Explain Every Air Quality Problem
Practical guide to VOCs vs. CO2 Indoors: Why One Sensor Cannot Explain Every Air Quality Problem, with decision checks, caveats, and sources.
Brief
Wildfire Smoke and Indoor Air Cleaners: What Helps, What Does Not, and What CO2 Cannot Tell You
Practical guide to Wildfire Smoke and Indoor Air Cleaners: What Helps, What Does Not, and What CO2 Cannot..., with decision checks, caveats, and sources.
Brief
CADR and Room Sizing: How to Translate Air Cleaner Labels Into Practical Coverage
Practical guide to CADR and Room Sizing: How to Translate Air Cleaner Labels Into Practical Coverage, with decision checks, caveats, and sources.