Review: uHoo AQI Monitor

Finally is here. After having an adventure with the postal service for +40 days the uHoo device found its way to my home. I want to thank uHoo for its persistence.

Let me start by saying that this is a very promising device because it features 9 separate Sensors for Air Quality monitoring and there isn’t any other device with so many sensors for indoor use. The company was founded in August 2014 and it took them two and a half years to develop uHoo.


  • RGB LED Light
  • Temperature Sensor -40°C to 85°C / 40°F to 185°F
  • Humidity Sensor RT 0-100%
  • Air Pressure Sensor 300-1,100mbar
  • Carbon Dioxide CO2 Sensor 400-10,000ppm
  • Carbon Monoxide CO Sensor 0-1000ppm
  • VOC Sensor 0-1,000ppb
  • PM2.5 Sensor 0-200ug/m³
  • Ozone O3 Sensor 0-1,000ppb
  • *Nitrogen Dioxide NO2 Sensor 0-1000ppb
  • Micro USB Power Input 5V DC
  • WiFi 802.11 b/g/n @ 2.4 GHz

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Bedside Water Taste & Chemistry

Have you ever noticed that the water tastes different when you leave it in a glass on your nightstand overnight?

In general during the 8h sleep, CO2 is built inside the room. Especially in winter when we don’t ventilate as frequent and CO2 can reach levels higher than 2,000ppm inside the house. CO2 is a soluble gas and water is the perfect solvent. As a result a process called Acidification is occurred naturally and the PH lowers during that process. That gives your bedside glass of water a horrible taste.

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OK Lab Stuttgart – PM DIY Monitor

An Outdoor PM DIY Monitor

Do you think the current PM (Particulate Matter) monitors are too expansive or too risky to leave them outside? Do you need proofs for convincing your local authorities to take actions against air pollution?

Then it’s time to build your own personal outdoor PM DIY Monitor. It won’t cost you more than €32 and it can feed your community with valuable data about the air quality. Use that data to prove how bad is the air quality in your neighborhood or community.

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Three Great Books for the Summer

Summer is here and everyone is on vacation, with spare time to read some great books. It doesn’t matter which one you will choose Mine or Rieuwerts’ or Swyers’ or all of them, just make sure you learn more about the air you breathe. Share with your loved ones and friends the knowledge you will get.

Make sure you follow us on Twitter at @SeeTheAirBook@AnAirThatKills@TomSwyers.
SeeTheAirAnAirThatKillsbook tom

The Air in New York

In my recent visit in New York and in other USA cities I decided to take with me a portable carbon monoxide device and measure the air quality across the cities during my trip.

The CO Sensor was placed on a net pocket that I had sewed on my backpack. I am quite the craftsman! The experiment had to be done correctly to ensure that the air flowed easily and the measurements were taken correctly and constantly.Read More »

Review: Cambridge Mask

This time I had the opportunity of getting a half face mask by Cambridge Mask Co. and of course I wrote with pleasure a review on my blog.


Cambridge Mask offers the N99 respirators (Not oil resistant), a three layer mask with a Military Grade Carbon Filter layer, and the Three-Ply Micro Particulate layer. An exhale valve is present as well to ensure that moist won’t build up.  These respirators also filter 99.6% of viruses and 99.77% of bacteria.Read More »

Exhaust Smoke Colours and Pollutants

Did you know that cars emit smoke with a differnt colour depending the engine that they use and the problems that they are having. Here are the following categories: Blue smoke, White smoke and Black smoke.


Blue Smoke

Blue smoke means your engine is burning oil. Oil is an important element in the engine, but only to lubricate the moving parts. When it is burnt by the engine means that there are leaking valve seals or worn piston rings or worn cylinder walls. In this case large quantities of Carbon monoxide CO, PMs, NO2 and SO2 are released into the environment.

White Smoke

There are two types of white smoke, the normal white vapor that disappears quickly under normal conditions due to condensation and the heavy white smoke. The heavy white smoke must concern you because the coolant has made its way into the combustion chamber. In this case large quantities of VOCs and PMs are released into the environment.

Black Smoke

Finally the black smoke indicates that your air/fuel mixture is running rich. Which means that more fuel is entering the engine and it doesn’t burn completely due to the lack of the air or oxygen. This is also called rich. When more air enters the engine than fuel this is called lean. In this case large quantities of CO, PMs and NO2 are released into the environment.


All in all, the emitted smoke from the exhaust may not tell you the exact problem, but it can give you an idea of what the problem of your engine is and the pollution that is emitted. Visit your mechanic immediately, public health may be in jeopardy.