Mask and air purifier testing services

How to Calculate CADR From an Air Purifier’s Airflow

Calculating CADR of an air purifier is not a simple task. That is why some use a shortcut to calculate the CADR by multiplying an air purifier’s airflow by its filtration efficiency. The problem? Calculating CADR from an air purifier’s airflow is not a reliable way to calculate CADR. This …

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What’s CADR and What’s the Difference With Airflow?

When buying an air purifiers, the terms ‘airflow’ and CADR are often used interchangeably to describe an air purifier’s performance. But what’s the difference between CADR (clean air delivery rate) and airflow? Are they the same thing? Or which one – CADR vs. airflow – should be used when buying …

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corsi rosenthal box

Corsi-Rosenthal Box DIY Purifier: 4 Things to Know

A fan, furnace filters, and some duct tape–can air purifiers be that simple? Meet the Corsi-Rosenthal Box (CR Box) DIY air purifier. The Corsi-Rosenthal Box is a powerful, low-cost air purifier that you can put together on the cheap. At Smart Air, we’ve been building, testing, and teaching people how …

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What Does the Number On My Air Purifier Mean?

What is the meaning of that number displayed on your air purifier? Many popular air purifiers including Xiaomi and Phillips display live air quality readings. But what exactly do these numbers mean and are they even accurate? In this article, we break down everything you need to know about that …

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What Are Ionizer Air Purifiers and Do They Work?

What are ionizer air purifiers and do they work? This is an important question because ionizer air purifiers are all over the place. For example, I was at a friend’s apartment in the US, and I saw his tower fan air purifier had an ionizer button on it: Ionizer air …

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Do portable air purifiers work?

Wearable Air Purifier Necklaces: Do They Work?

Small, wearable air purifier necklaces have become popular to protect against viruses and other pollutants. They’re small, lightweight, portable, and fairly cheap. Here’s one personal air purifier on Amazon claiming to eliminate germs, dust, viruses, COVID-19, and more from the air. In the Philippines, President Duterte has been seen wearing …

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Why You Should Never Use Your Air Purifier’s Auto Mode

Many air purifier companies add fancy features to help market their products.  One of these features is an air purifier auto mode, also called “smart mode”. The problem? Test data shows an air purifier’s auto mode routinely fails, leaving users with dangerous air. The idea behind smart purifiers’ auto mode …

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What Size Air Purifier Do I Need? [3 Steps]

Air purifiers come in all different sizes, so how can you know what size air purifier you need? In this article, we break down the three steps to know what size air purifier you need and how a metric called CADR can help with this. Step 1: Measure Size (Volume) …

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Smart Air is a social enterprise that creates simple, no-nonsense air purifiers and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.