👋 Scientist here. Here are some science-backed tips that will help protect your health against wildfire smoke:
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Yes! Filtering indoor air during periods of heavy wildfire smoke is necessary! Canada has some terrible wildfire seasons now. The 1st photo is 3 days of 24hr filtering through really heavy smoke. This is in ADDITION to the Hepa filter on the furnace while A/C was running. The DIY box fan works great