My DIY Air Purifiers

This summer I decided to design and hopefully build a DIY Air purifier. I came up with three designs and I need your vote to help me choose one of the three.

  1. Maybe one of the simplest DIY purifier equipped with a fan, a HEPA / activated carbon filter.
  2. This one allowes more aire to flow from the bottom to the top thanks to its cone shape again with a HEPA / activated carbon filter but it takes more space.
  3. A wooden purifier, equipped with two smaller fans and a HEPA / activated carbon filter.

Vote by leaving a comment bellow. In case you have any suggestions I would love to read about them as well.

DIYPurifier all

My opinion about VOC Sensors


It has been quite some time now since I have had 2 devices with VOC sensors and I want to express my honest opinion about them. I am not going to talk about the brands but only I will discuss my opinion if the VOC sensor have a value to the user.

One of devices displays the measurments in ppb and the other one displays an index value from 1 to 5. At the beginning I was thinking that ppb is a better way to display pollution inside the house “more accurate” but after a while I understood that it doesn’t matter because index values are a greater and easier way for the avarage users to understand that.

VOC sensors measure a variety of harmful chemical compounds with carbon atoms (aka organic) like Acetone CH3(CO)CH3, Benzene C6H6, Ethylene glycol C2H6O, Formaldehyde CH2O, Toluene C7H8,Xylene C8H10, etc… but also other non harmful VOCs as well, for instant when I clean my house I use distilled water and organic essential oil, tea tree to be more exact. Tea tree’s components are Terpinen-4-ol C10H18O, γ-Terpinene C10H16, Aromadendrene  C15H24 etc… all with Carbon atoms which they trigger the VOC sensor. As you can understand if you don’t have the chemical knowledge for each particle in the air, you might get confused by the alerts your VOC sensor gives you.


Many users have told me that they indeed feel confused by the readings the VOC sensor gives them. The researchers on the other hand say that at least you know the concentration of some organic gas is higher than normal, and you can start thinking about why that occurs.

I am not in favor of researchers’ opinion, the user has to know excaly what isn’t going well with his air quality and not guessing.

DIY IoT Sensors Weather-Air

Interesting DIY projects for Weather-Air devices. Sure there are many Brand devices out there that measure air pollution or weather conditions but prices can get high, so if you have the skills to solder then you can design a device for your own needs. There are a lot of DIY projects out there, so choose the best for you and your wallet.

1.   Easy IoT weather station with multiple sensors by Ingenerare

Estimated cost of the project around 15$

Easy IoT weather station with multiple sensors

2.    Air Pollution Detector by ESC2018

Estimated cost of the project ∼80$ with many gas sensors

Air Pollution Detector


3.   Air Pollution and Environmental Monitor by EricT93

Air Pollution and Environmental Monitor



4.   How To Smell Pollutants by liseman

How To Smell Pollutants


5.   Build Your Own Particle Sensor

Build Your Own Particle Sensor


6.   DIY your own air quality monitor with Arduino

DIY your own air quality monitor with Arduino


7.   Air Quality Test Box by Seeed Studio

Air Quality Test Box