Latest posts

  1. For Shits and Giggles: Optimized Sequential Sampling from Multiple Sensors (Arduino)

    By treating sensor sampling as a statistical challenge one can reason about how many samples to take from each sensor given a limited time interval for sampling (eg. 1s). It turns out that 30 samples per sensor is fine, and indeed, even one sample per sensor each second works. But life isn't only about usefulness, read on to follow my messy thoughts and perhaps learn a thing or two along the way.

    local_offer optimization, arduino, mq131, winsen, ze25-o3, sensor, ozone, code, no2

  2. Measuring NO2 with a Winsen ZE25-O3 Ozone Sensor

    We set out to measure ozone but ended up getting better results measuring NO2. In the absence of a reference sensor, we correlated our measurements with the closest city air quality monitoring station. We used the correlation as a metric for how well the sensor was performing. Finally, we also combined this with studies about the indoor/outdoor ratio of NO2 to estimate indoor NO2 concentration.

    local_offer winsen, sensor, code, ze25-o3, ozone, no2, arduino

  3. Air Pollution Primer

    This introduction will teach you important concepts that will help you to protect yourself and your family. The goal is to give you an overview that can serve as a basis for further learning. We'll cover important concepts such as PM2.5, PM10, VOC, ventilation, common air purification technologies and why all of this is important.

    local_offer introduction, primer

  4. Smarter Kids and Fewer Sick Days Through Clean Air

    The younger you are the more important air quality seems to be, indeed, even before birth air pollution can be harmful. This blog post looks at the relation between air quality and cognitive development, as well as number of sick days in schools.

    local_offer intelligence, cognitive development, sick days, children

  5. Ignorance Isn't Bliss

    Not knowing can indeed help you worry less. But when it comes to the air we breath, we can actually do something about it. Sadly, we recently learnt in a very concrete manner that awareness can save lives. This blog post helps you develop a better intuition about air pollution and give you some concrete advice of how to reduce your and your family's air pollution exposure.

    local_offer awareness, danger, indoor, outdoor

  6. Large-Scale Outdoor Air Purification

    With the great consequences that dirty air has on people, there's no surprise that experts have attempted to solve it by attacking the problem of pollution from different angles. This blog post is a brief exploration looking at examples of large-scale outdoor air purification.

    local_offer large scale, outdoor, delhi, beijing, india, china, water cannon, pulsed radio frequency energy, tio2, solar-assisted large-scale cleaning system, xian

  7. It All Starts with a Breath

    Learn what this blog is about as well as some interesting facts about why we all should care about air quality. After reading this you'll have a great idea of what you can expect in the future as well as our taste for including references and general writing style.

    local_offer why, small actions