Indoor radon study: regina and moose jaw at 301.7 bq/m³ (238 cities)

OpenStats ranks indoor radon using Health Canada cross-country survey means mapped to hometown slugs. The 2025 study edition lists 238 communities on the highest-indoor-radon series, with survey vintage carried forward from the 2012 to 2013 CMA release noted on the edition page. Regina, Moose Jaw, and Weyburn share the top survey mean at 301.7 Bq/m³ on that edition. A cluster of Manitoba communities follows at 256.7 Bq/m³, including Winnipeg.

2025 study leaderboard (selected)

Tied means reflect shared survey geographies on the Health Canada map. Several Saskatchewan cities share 301.7 Bq/m³ because the underlying survey cell covers the same regional mean. Manitoba rows at 256.7 Bq/m³ behave the same way. Readers should open each hometown chart and note whether the row is direct atlas tier or regional proxy on the radon atlas.

Study edition vs direct atlas rows

The study ranks 238 communities for City Score indoor-air pillar standing. Direct-tier radon atlas pages cover a smaller verified set (34 direct locations in the atlas export). A separate desk story walks direct-tier averages by province using only verified atlas rows. Use the study when you need national rank context inside City Score. Use direct atlas pages when you need a municipal or CMA survey reading labeled without regional proxy.

Regina and Winnipeg appear at the top of the study table with the means above. Calgary and Toronto sit lower on the same edition with higher standing on the indoor-air pillar when survey means are smaller. Health Canada guidance treats 200 Bq/m³ as the action level for long-term exposure; survey means describe community distributions, not a test result for your home.

How radon enters City Score

Indoor air is one of eight equal-weight pillars. Higher survey means produce worse standing on the radon series (direction is lower rank worse for crime, radon uses higher mean as worse outcome). Missing radon rows leave the pillar at median standing until a survey geography matches the slug. Edition metadata flags carried-forward survey years so readers know when the underlying Health Canada release predates the panel year.

Open the radon ranking for the live sort, the indoor radon guide for testing context, and the radon atlas for city pages with tier badges. Compare this study story to direct-tier radon by province when you need verified atlas rows only.

Tied means and shared survey cells

Tied means on the 2025 study leaderboard reflect shared survey geographies on the Health Canada map. Several Saskatchewan cities share 301.7 Bq/m³ because the underlying survey cell covers the same regional mean. Manitoba rows at 256.7 Bq/m³ behave the same way. Readers should open each hometown chart and note whether the row is direct atlas tier or regional proxy on the radon atlas before they treat a tied mean as an independent municipal measurement.

Regina, Moose Jaw, and Weyburn share the top survey mean at 301.7 Bq/m³ on the edition page with survey vintage carried forward from the 2012 to 2013 CMA release noted there. A cluster of Manitoba communities follows at 256.7 Bq/m³, including Winnipeg. Cowansville and Sherbrooke appear lower on the selected table with tied Quebec means at 238.2 Bq/m³.

Action level language versus study ranks

Health Canada guidance treats 200 Bq/m³ as the action level for long-term exposure. Survey means describe community distributions rather than a test result for an individual home. Calgary and Toronto sit lower on the same edition with higher standing on the indoor-air pillar when survey means are smaller. Indoor air is one of eight equal-weight pillars, and higher survey means produce worse standing on the radon series. Missing radon rows leave the pillar at median standing until a survey geography matches the slug.

Study edition versus direct atlas rows

The study ranks 238 communities for City Score indoor-air pillar standing. Direct-tier radon atlas pages cover a smaller verified set with thirty-four direct locations in the atlas export noted on related desk stories. Use the study when you need national rank context inside City Score. Use direct atlas pages when you need a municipal reading labeled without regional proxy. Open the radon ranking for the live sort, the indoor radon guide for testing context, and the radon atlas for city pages with tier badges.

Edition metadata flags carried-forward survey years so readers know when the underlying Health Canada release predates the panel year. Compare this study story to direct-tier radon by province when you need verified atlas rows only. Composite readers should return to hometown charts to see how indoor-air standing combines with tax, construction, connectivity, water, seismic hazard, growth, and crime inputs on equal-weight math.

Corpus maintenance and survey vintage

The 2025 study lists 238 communities with coverage_n documented on the edition page and survey_year 2013 carried forward where Health Canada geographies attach to hometown slugs. Editors updating radon copy should cite that vintage when they explain why panel year and survey release year differ. OpenStats rebuilds study placements when ingest refreshes, yet household testing guidance still comes from Health Canada documents linked on the indoor radon guide. National rank context inside City Score always flows from the study row on the hometown chart, while atlas tier badges explain whether a public page carries direct or proxy labeling.