Learn simple, practical steps to measure indoor air pollutants and choose the right air quality monitor — from budget options to pro-level formaldehyde detectors. Why Test Your Home Air Quality? Indoor air can be more polluted than outdoor air due to cooking, cleaning products, furniture off-gassing, and poor ventilation. Regular testing helps you spot problems early — such as high PM2.5, elevated CO₂, or dangerous formaldehyde — so you can protect your family’s health. What To Measure: The Key Indoor Pollutants PM2.5 / PM10 — fine particles from cooking, smoke, dust, and pollen. CO₂ — indicates ventilation quality; high levels make you drowsy and reduce cognitive performance. VOCs — volatile organic compounds from paints, cleaners and new furniture. Formaldehyde (HCHO) — common after renovations or from pressed-wood furniture; harmful at low concentrations. Temperature & Humidity — affect comfort and mold risk. How to Test the Air Quality in Your Home — Step-by-Step Choose the right monitor — pick a device that measures the pollutants you care about (PM, CO₂, VOCs, HCHO). Place the meter correctly — test main living areas and bedrooms; keep the device ~1m above the floor and away from windows/vents. Let readings stabilize — run the monitor for 5–15 minutes to get stable results. Record and compare — test at different times (cooking, idle, after airing out) to find patterns. Take action — ventilate, use HEPA purifiers, remove sources, or consult professionals if formaldehyde or persistent high PM is detected. Recommended NOYAFA Options — Two Price Tiers JMS11 Air Quality Meter Entry-level air quality meter — measures PM2.5/PM10, CO₂, temperature & humidity. Compact and easy to use for homeowners. View JMS11 → JMS17 Indoor Air Quality Tester (with HCHO) Advanced model including formaldehyde (HCHO) detection, TVOC measurement, plus PM and CO₂ — ideal for renovated homes, new furniture, and sensitive users. View JMS17 → Interpreting Common Readings PM2.5: < 12 µg/m³ (good), 12–35 (moderate), >35 (unhealthy for sensitive groups). CO₂: < 800 ppm (good), 800–1000 ppm (moderate), >1000 ppm (poor ventilation). Formaldehyde (HCHO): < 0.08 mg/m³ preferred; higher values need immediate attention. TVOC: Low is better — spikes after renovation indicate off-gassing. Quick Fixes to Improve Indoor Air Quality Ventilate: open windows for 10–20 minutes several times daily. Use a HEPA air purifier to remove fine particles. Control humidity (30–50%) to prevent mold. Avoid VOC-heavy products; let new furniture or paint off-gas outdoors first. If formaldehyde is high, increase ventilation and consider removal/replacement of the source or professional remediation. Why Choose NOYAFA Air Quality Monitors? NOYAFA meters combine reliable sensors, user-friendly displays, and portable designs suitable for home and small-office use. The JMS11 is cost-effective for routine checks, while the JMS17 adds formaldehyde detection for more demanding environments. Shop All Air Quality Monitors → Published by NOYAFA — accurate, portable instruments for healthier indoor environments.