National numbers, July 30

Several major metrics continue to point to a summer increase in COVID-19 spread. Coronavirus levels in wastewater are up in all major regions, as is test positivity from the CDC’s network. Hospitalizations have started ticking up as well.

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Tips for using a portable HEPA filter

After I shared my travel experience last week, a couple of readers reached out asking for more details on using a portable HEPA filter, essentially a small air filter that can be moved from one place to another. So, here are a few tips and resources.

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National numbers, July 23

COVID-19 data in the U.S. is showing increasingly clear signs of a summer surge, with infections rising across the country. However, thanks to the federal public health emergency’s end, we have less and less data to track this trend.

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