Recent PM2.5 Articles:

The Really Small Stuff

To test how effective the DIY filter is, I’ve been posting lots of data on 2.5 micron particles. But my particle counter also measures smaller 0.5 micron particles, and I’ve been looking closely at that lately.     Remember that the “PM2.5” you hear in the news is different from the numbers on most particle counters. […]

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PM2.5 Particle Size Virus