What's the difference between air particle counter and formaldehyde detector

Fine particulate matters are the main content of air pollution
Fire, factories pollution all produce this air, also it is the haze block our eyesight.
Air particle counter is use to check the fine particulate matters (pm2.5）value
Formaldehyde gas also we call it HCHO, also very hurt to human body.
Usually it exist in the new decorate house and new painting furniture.
The good quality air purifier can filtering it.
There are air particle counter and formaldehyde detector on the market sell seperately.
New item has combine both function in same machine

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