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Information only — not radiological, medical, remediation, or treatment advice. For active radon mitigation, suspected well-water contamination, or any acute radiation incident, contact a qualified radon professional, your national radiation protection agency, your water utility, or a medical professional — read About.
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ActSmall · Ground
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Single-page A4 handout - ink-friendly. Open with ?country=USA (or any ISO3) to populate the country line, the headline indicator, and the picked action.

ActSmall · Ground

What comes up from below - radon, well water, and the small thing to do about it.

Your country Open the live map at actsmall.org/ground/

Headline indicator

Open the live map for today's reading.

Source: open data, refreshed daily - see the live map for citations.

Act

One concrete next step for this country

Visit actsmall.org/ground/ to see what fits this country today. The usual answer is a $20 home radon test kit.

Where to start https://ground.actsmall.org/

Two more things you can do

  • Open the live map for today's pick.
  • Forward this page to two more people.
  • If your home has a basement, order a $20 short-term radon test kit and place it on the lowest lived-in level.
Visit ground.actsmall.org on a connected device.

Live map ground.actsmall.org

About ActSmall is a free, public-good civic-action portal. No accounts. No tracking. Nothing for sale.

Printed today · Informational only, not certified advice. actsmall.org

Public-good information about indoor radon, well-water contaminants, and related public-health context. Nothing on this site is medical advice, mitigation engineering advice, or a substitute for a calibrated home test. For an actual incident or remediation decision, rely on a qualified local professional and your national radiation protection or environmental agency. ActSmall · Ground is informational only. It is not medical, first-aid, treatment, or engineering advice. Provided as-is, with no warranty. Check and follow your local laws and regulations.

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