Use a home air quality monitor with PM2.5, PM10, CO2, VOC, temperature, and humidity sensors
Place the monitor in a central indoor location away from windows, vents, and direct sunlight
Let the device run continuously for accurate readings
Check the PM2.5 value as the main indicator for AQI indoors
Compare the measured PM2.5 and other pollutant levels with your local AQI scale
Use a calibrated sensor or a trusted brand for better accuracy
Measure at different times of day to capture changes in air quality
Test near common pollution sources such as cooking areas, smoking areas, or cleaning product use
Keep windows closed during outdoor pollution events and compare indoor versus outdoor readings
Record readings over time to identify patterns and pollution spikes
Replace filters and maintain the device according to the manufacturer’s instructions
Verify readings with a second monitor if you need higher confidence
Use a mobile app or AQI calculator linked to the monitor if available