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New recommendation advise using an additional layer of polypropylene fabric in cloth masks to act as a filter. (Sara Alas/Niko Apparel)

Polypropylene, the material now recommended for COVID-19 mask filters: What it is, where to get it

Everything you need to know about non-woven polypropylene, the fabric now recommended for use as a filter in cloth face masks: What it is, what to look for and where to find it.
Fast tests can help keep people out of the water when it’s unsafe, and let them back in sooner once the coast is clear. Paul Fisher

Rapid water quality tests better protect beachgoers

Traditional water quality test results tell you what was happening at the beach yesterday. More real-time answers can be a boon for public health.

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