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0 to 500, with higher values indica�ng higher levels of air pollu�on and adverse health effects. AQI assessments can show PM2.5, PM10, O , SO , NO , CO, etc. Temtop calculates AQI according to EPA standards and focuses only on PM2.5 and PM10.
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★ Do not expose the detector to heavily contaminated environments for long periods, as this can damage the sensor. ★ Do not use the detector in wet condi�ons for extended periods to ensure accurate measurements. ★ Do not use the detector for long periods in environments with a strong, irrita�ng smell to ensure accurate measurements.
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Follow US EPA particulate pollution standards to calculate AQI. (0.44 lb)
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● For indoor use: Keep the room/area air�ght for 10 minutes to obtain more accurate results. ● On the switch-off screen, the indicator light flashes yellow during charging and is always green when charging is complete. ● If the ba�ery level shows , please charge the detector in �me to avoid being affected during use (it can also recharge when switched off).
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PM2.5 concentra�on will auto-display a�er the countdowns: Then press Home Bu�on to display AQI concentra�ons:...
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Then press the Home bu�on to display the TVOC concentra�on. Then press the Home bu�on again to display the HCHO index: Manual Loop: Repeat the above steps can manually loop the display in order of PM2.5, AQI, TVOC, and HCHO. Auto Loop: Double press the Home Bu�on can loop each display every 3s.
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PM2.5 concentra�on will auto-display a�er turning on countdowns; Then press Home Bu�on to display the AQI index: Manual Loop: Repeat the above steps can manually loop the display in order of PM2.5, AQI. Auto Loop: Double press the Home Bu�on can loop each display every 3s. Double press again to exit Auto Loop mode.
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The indicator lights on the panel indicate the corresponding air quality: The ba�ery level indicator on the screen indicates the device charging status: When the ba�ery level is low, please charge it by connec�ng it to the USB cable and power supply.
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It is advisable to calibrate the detector a�er three months of use. Calibra�on instruc�ons are as follows: a) Switch on the detector and wait for approximately 10 minutes. b) Press and hold the calibra�on bu�on for more than 1 second using the needle tool un�l the HCHO icon on the screen flashes.
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Follow EPA particle pollution standards to calculate the AQI for PM2.5.
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Q: Why is the PM2.5 reading constantly changing? A: PM2.5 concentra�ons in the environment are constantly changing, not only due to environmental factors such as changes in airflow, moisture, and wind pa�erns but also due to the presence of such familiar sources as smoking, cooking, vehicle emissions, smoke from coal burning/chimney/stoves, etc.
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Q: Which HCHO readings are inaccurate or overestimated at certain times? A: Since Temtop uses a high-precision electrochemical HCHO sensor, its electrochemical response characteris�cs can also respond to gases other than formaldehyde. The table lists the most common gases that interfere with the rela�ve sensi�vity of HCHO sensors.
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