Surgical masks are designed to be worn in one direction only. However, it can be difficult to know which way round a medical face mask should go. Should the blue side face out, or in? Some surgical masks are white all over, which way round should these white face masks … Read more
Агаар цэвэршүүлэгч нь вирусыг шүүхэд маш үр дүнтэй бөгөөд дамжих эрсдлийг бууруулж болох юм. Тэгэхдээ хэрэв Ковид-19 туссан эсвэл эдгэж байгаа хүнд агаар цэвэршүүлэгч хэрхэн тусалж чадах юм бол? Энэ нөхцөлд ХЭПА шүүлтүүр бүхий агаар цэвэршүүлэгчийг хэрхэн ашиглах нь үр дүнтэй вэ? ХЕПА шүүлтүүр бүхий агаар цэвэршүүлэгчийг Ковид-19-с эдгэж буй … Read more
Analysis of the latest air quality data by Smart Air found that PM2.5 levels in Ulaanbaatar fell by 23% in the 2019 winter. The main reason is likely to be a new initiative introduced by the Government of Mongolia in May 2019 to from coal-fired stoves. Despite the improvement, the … Read more
Хэрхэн өөртөө короновирусын маск хийх вэ? Өөрийн гараар маск хийх нь галзуу санаа. Гэхдээ шинжлэх ухаанчдын туршилтаас гарсан тоо баримт ч адил галзуу юм. Яагаад өөрийн гараар маск хийх нь УТГАГҮЙ вэ? Аль хэдийнээ зах зээл дээр байдаг маскууд вирусыг шүүдэг гэдгийг судалгаанаас гарж болно. Бас дээрээс нь тэд нар … Read more
Multiple companies claim only their HEPA filters capture nanoparticles. But this is simply not true. Read on to find out why. Wikipedia’s article on HEPA filters states: “Standards require that an air filter must remove […] 99.97% of particles that have a size greater than or equal to 0.3 µm.” … Read more
This will sound like a grand claim, but two filters are all you need. Here’s why (with data). Very Reasonable Reasons To Be Skeptical Why might you be skeptical? For one, big purifier companies are in an arms race to tell you they have more filters than the next … Read more
Car air purifiers sound like a great idea. Soon after I started making DIYs, people emailed me asking if we could make a DIY for their car. My initial reaction was, “Great idea!” On the highways, we’re surrounded by all of that awful pollution. Best to get a car air purifier. … Read more
Air purifiers work best in a closed room environment and this worries some who are concerned that there wouldn’t be enough oxygen coming in when all doors and windows are closed. Yet recent tests in a real apartment — with as many as seven people in a small room — show less … Read more
Tests show that keeping the doors and windows closed will keep particulate levels at 50% less than outdoor air on average. But some people really want to keep their windows open. For some people, it’s an old wive’s tale that windows must be kept open. For others, it’s a way to … Read more
When buying a purifier, you’ll sometimes see companies use the word “airflow” (风量) to describe an air purifier’s performance and other companies the word CADR (clean air delivery rate) as seen in the picture below. They’re both a measure of purifier performance, but are they the same thing? … Read more
