Ever since we launched the Blast and Blast Mini industrial air purifiers in 2017, we’ve wanted to get good data on how long hepa filters last. These filters are huge, 10-20 times the size of our DIY purifier filters in fact. We’d expect the HEPA lifespan to be much longer, but let’s …
Estimating Lifespan from the DIY 1.0 Longevity Tests The Blast HEPA is 20 times bigger than the DIY 1.0 and it is made of the same material. Thus, is it reasonable to think that the Blast HEPA will last 20 times as long? Not really, because the Blasts push more …
This article includes supplemental data for the main article “So You Thought Hong Kong’s Pollution Comes From the Mainland?” This supplemental data will show how high and low wind speeds affect the PM2.5 levels and hence Hong Kong’s pollution. Ultimately, this supplemental article draws the same conclusion as the main …
Air pollution is a serious problem in Hong Kong, and Hong Kongers often complain that the worst of it comes from Mainland China. Is that fact or a convenient scapegoat? After all, Hong Kong is a densely populated developed city with one of the busiest ports in the World – …
Here’s a question I often get asked about air purifiers: “I don’t want to hear the fan while I sleep, so can I run my air purifier for an hour and then turn it off before I sleep at night? Or should I sleep with my air purifier on at …
Hong Kong doesn’t come to mind when people think of air pollution. However, the data tells a different story–one that has important implications for Hong Kongers’ health. Hong Kong’s Air Pollution in Numbers I just analyzed data on Hong Kong’s pollution data and found that PM2.5 averaged 30 micrograms in 2018. …
Over 100 years after “London Fog,” is London’s air safe? I just analyzed data on London’s PM2.5 air pollution—tiny particles in the air measuring 2.5 microns and below. In 2018, London averaged 12 micrograms of PM2.5, that’s higher than the World Health Organisation annual limit. What Does That Mean? Based …
