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EPA says radon causes about 21,000 US lung cancer deaths a year, about 2,900 among never-smokers. Fix at 4 pCi/L (150 Bq/m³) or more; consider it between 2 and 4. CDC: short-term tests take 2–90 days, long-term over 90; retest if a result is 4 or more. With a unit converter.

The US EPA says empty, wipe dry and refill portable humidifiers daily and clean them every third day. It recommends bottled water labelled “distilled”, says don’t humidify above 50%, and to turn it down if the area around it gets damp.

The US EPA says keep indoor humidity below 60% if possible, ideally 30 to 50%, and dry condensation on windows or walls quickly while reducing the source. Clean mould under about 10 square feet yourself with detergent and water, and never mix bleach with ammonia cleaners.