What is a HEPA filter and how does a HEPA filter work?

What Are HEPA Filters and How Do They Work?

The term “HEPA filter” can be confusing. What does HEPA stand for? What is a HEPA filter made from, and what actually makes it a HEPA filter? What is a HEPA Filter? “HEPA” stands for “high-efficiency particulate air” (filter). It sounds complicated, but HEPA air filters are nothing fancy. They …

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Study Finds Ionizers Increase Air Pollution

A peer-reviewed study from the University of Texas finds that ionizers increase air pollution, creating formaldehyde, ozone, and particulate. This data contrasts sharply with claims from air purifier companies that market ionizers as magical machines. One company in China claims that their machine’s negative ions “remove PM2.5 particulate pollution and …

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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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Can Air Purifiers Remove Asbestos From the Air?

Asbestos are extremely dangerous and cause cancer. Can air purifiers remove asbestos from the air and make your home safer? To know how effective air purifiers are at removing asbestos from the air, we first need to know whether asbestos is solid or gas. HEPA purifiers capture particles, not gases. …

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Are True HEPA Filter Air Purifiers Better?

Many air purifier companies market their air purifiers as “True HEPA” air purifiers. For example, Philips touts the True HEPA filters in their air purifiers and its filtration efficiency. Even some so-called “experts” claim you need a True HEPA filter in your air purifier. So what exactly are True HEPA …

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How Blueair Air Purifiers Can Create Dangerous Ozone

Blueair states their air purifiers use HEPASilent technology. They avoid any link to ionizers by claiming that it involves an ‘ion chamber’ that doesn’t emit ions to the room or produce ozone. However, we took apart a Blueair 203 purifier to take a look at this ‘ion chamber’. It turns …

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Most Underrated Natural Way to Lower Blood Pressure

If you search for a solution to lower blood pressure naturally without medication, you will often find the results shown below. The problem is most of the top results are missing one of the most powerful, simple ways to lower blood pressure naturally. This natural method of lowering blood pressure …

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Calculating CADR with airflow and filtration %

How to Calculate CADR From an Air Purifier’s Airflow

CADR tests, used to calculate an air purifier’s effectiveness at cleaning air, are typically used to compare the performance of different purifiers. However, performing a CADR test is not simple: it requires a particle monitor, a sealed 30m3 test lab, and tightly controlled testing conditions. Because of the complexity of …

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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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Smart Air low cost purifiers

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.

Certified B-Corp air purifier company