Sarah Chen
Indoor Air Quality Specialist
Sarah has spent over a decade researching indoor air pollution and its health effects. She holds a Master's in Environmental Health from Columbia University and has tested hundreds of air purification systems in controlled environments.
M.S. Environmental Health, Columbia University. 10+ years testing air purification systems. Former air quality researcher at the EPA.
Areas of Expertise
Articles
Air Quality Monitor vs Air Purifier: What You Actually Need
Air quality monitors and air purifiers solve different problems. We explain which you need first, when you need both, and how to use them together effectively.
March 14, 2026
Best Air Purifiers for Allergies: HEPA Filters That Actually Work (2026)
The 7 best air purifiers for allergies in 2026 — pollen, dust mites, pet dander, and mold. Ranked by True HEPA filtration and CADR ratings.
February 10, 2026
Best Air Purifiers for Asthma: Doctor-Recommended HEPA Models (2026)
6 best air purifiers for asthma in 2026. True HEPA filtration, zero ozone, and AAFA-certified picks that reduce asthma triggers at home.
February 13, 2026
Best Air Purifiers for Dust: 7 Models We Recommend (2026)
7 best air purifiers for dust removal in 2026, ranked by CADR ratings, filter type, and room coverage. True HEPA picks for any room.
March 25, 2026
Best Air Purifiers for Mold: HEPA Models That Work (2026)
We compared HEPA air purifiers for mold spores, musty odors, and basement air quality. These 6 picks capture mold at 0.3 microns and neutralize mycotoxins.
February 24, 2026
Best Air Purifiers for Offices (2026)
5 best air purifiers for offices. Quiet models under 31 dB for cubicles, open plans, and home offices with strong CADR and smart features.
March 28, 2026
Best Air Purifiers for Pets: Hair, Dander & Odor (2026)
The 7 best air purifiers for pets in 2026, ranked for dander, hair, and odor removal. Top pick: Levoit Core 600S with washable pre-filter.
March 4, 2026
Best Air Purifiers for VOCs: Models with Activated Carbon & CADR Ratings (2026)
7 best air purifiers for VOCs in 2026, ranked by activated carbon weight and gas filtration. Top pick: IQAir HealthPro Plus (5 lb carbon). Budget: Winix 5500-2 ($150).
March 24, 2026
Best Air Purifiers Under $100 (2026)
6 best budget air purifiers under $100 with True HEPA filtration. Verified CADR ratings, real performance, and low running costs.
February 27, 2026
Best HEPA Air Purifiers Under $200 (2026)
We tested and compared the top air purifiers under $200. These 7 budget picks deliver real HEPA filtration, strong CADR ratings, and low running costs.
March 1, 2026
Best Air Purifiers with Washable Filters (2026): Save on Replacements
The 6 best air purifiers with washable filters in 2026. Permanent, reusable, and washable pre-filter options ranked by long-term savings and performance.
March 28, 2026
Best Air Purifiers (2026): Our Top 8 Picks After Testing Dozens
The 8 best air purifiers of 2026 for every budget and room size. Ranked by CADR, noise, filter cost, and real-world performance.
April 3, 2026
Best Air Quality Monitors Under $50: Budget Picks That Actually Work (2026)
Best air quality monitors under $50 in 2026. Budget picks that provide real, useful PM2.5 and VOC data without breaking the bank.
March 5, 2026
Best CO2 Monitors for Classrooms and Offices (2026)
Best CO2 monitors for classrooms and offices in 2026. Track ventilation levels and know exactly when to open windows.
February 25, 2026
Best CO2 Monitors for Home: Track Your Indoor Air Quality (2026)
Best CO2 monitors for home in 2026, from budget NDIR sensors to premium multi-parameter devices. Accurate readings to ventilate smarter.
February 19, 2026
Best Indoor Air Quality Monitors: Track What You're Breathing (2026)
Best indoor air quality monitors in 2026. Devices that measure PM2.5, CO2, VOCs, and more — see what is in your air and when to act.
February 14, 2026
Best PM2.5 Monitors for Wildfire Smoke (2026)
Best PM2.5 monitors for wildfire smoke in 2026. Track particle levels indoors and out so you know when to seal up or run your purifier.
March 2, 2026
Best Portable Air Purifiers (2026)
5 best portable air purifiers for travel, cars, desks, and hotel rooms. Battery-powered and USB-C options with real HEPA filtration.
April 2, 2026
Best Radon Detectors for Home: Continuous Monitors That Protect Your Family (2026)
Best continuous radon detectors for home in 2026. Ongoing readings so you can act before radon levels become dangerous.
March 10, 2026
Best Replacement HEPA Filters for Popular Air Purifiers (2026)
Find the right replacement HEPA filter for your Levoit, Coway, Winix, or Blueair air purifier. We cover OEM options, costs, and replacement schedules.
March 27, 2026
Best Smart Air Purifiers: WiFi Models With App Control (2026)
The 6 best smart air purifiers with WiFi, app control, and voice assistant support. Ranked by air quality sensors, CADR, and smart home integration.
March 29, 2026
Does Vaping Affect Indoor Air Quality? What the Research Says
Vaping raises indoor PM2.5 to 150+ µg/m³, 10x the WHO safe limit. What vape aerosol contains, health risks, and how to protect your air.
April 1, 2026
Essential Oil Nebulizers and Air Quality: What Diffusers Actually Do to Your Indoor Air
Essential oil diffusers release VOCs and PM2.5 particles that degrade indoor air quality. Learn what the research says and how to use them safely.
March 15, 2026
What Is a Good CO2 Level Indoors? A Clear Guide to the Numbers
What CO2 level is safe indoors? How it affects focus, sleep, and health — with clear thresholds and when you need to act.
February 23, 2026
How to Choose an Air Purifier: A Complete Buyer's Guide (2026)
How to choose an air purifier: room size, filter types, noise levels, and running costs explained. Pick the right one the first time.
March 7, 2026
How to Read Your Air Quality Monitor: Every Metric Explained
Learn what PM2.5, CO2, VOCs, humidity, and temperature readings mean on your air quality monitor, with healthy ranges and when to take action.
March 15, 2026
How to Test Air Quality at Home: A Practical Guide (2026)
Learn how to test your indoor air quality using monitors, test kits, and free methods. We cover CO2, PM2.5, radon, VOCs, and humidity with actionable steps.
February 28, 2026
How to Use an Air Quality Monitor with Your HEPA Purifier
Pair your air quality monitor with a HEPA purifier for data-driven air cleaning. Setup, placement, and how to read the numbers.
March 19, 2026
Indoor Air Quality Basics: What You Are Breathing and Why It Matters
Indoor air is 2-5x more polluted than outdoor air. What pollutants are in your home, how to measure them, and what actually helps.
February 11, 2026
Understanding the Air Quality Index (AQI): A Complete Guide to the Numbers
Learn what AQI means, how the 0-500 scale works, what each color code signals, and what to do at every level to protect your health.
March 18, 2026
VOCs Explained: The Invisible Gases Polluting Your Indoor Air
VOCs are invisible gases from everyday household products. Common sources, health effects, and practical ways to reduce them at home.
March 19, 2026
What Is PM2.5? The Invisible Pollutant in Your Home
PM2.5 are tiny particles that penetrate deep into your lungs and bloodstream. Learn what they are, where they come from, and what levels are safe.
March 17, 2026
Where to Place Your Air Quality Monitor for Accurate Readings
Learn exactly where to place your air quality monitor in every room. Avoid common mistakes that cause false readings and get data you can trust.
March 16, 2026
Comparisons
Airthings Corentium Home vs Ecosense EcoQube: Our Pick (2026)
A detailed comparison of two popular continuous radon detectors — the Airthings Corentium Home and Ecosense EcoQube. One is portable and budget-friendly, the other offers WiFi and faster initial readings.
Aranet4 HOME vs Airthings View Plus: Which Is Better? (2026)
A detailed head-to-head comparison of the Aranet4 HOME and Airthings View Plus air quality monitors. Two premium devices with very different approaches — one excels at CO2 accuracy and portability, the other covers 7 parameters including radon.
Coway Airmega 200M vs Levoit Core 400S: Which Wins? (2026)
A detailed head-to-head comparison of the Coway Airmega 200M and Levoit Core 400S air purifiers. We tested both for 30 days to find out which one delivers better air quality, quieter operation, and more value for your money.
Levoit Core 300 vs Core 400S: Which Should You Buy? (2026)
Levoit Core 300 vs Core 400S: we break down CADR, noise, smart features, and long-term costs to help you pick the right budget Levoit air purifier for your room size and needs.
Molekule Air Mini+ vs Levoit Core 400S: PECO vs HEPA (2026)
Molekule Air Mini+ vs Levoit Core 400S: we compare PECO technology against True HEPA filtration on airflow, noise, filter costs, smart features, and overall value to help you choose the right air purifier.