Direct-tier radon atlas: 34 verified cities, regina 301.7 bq/m³

The radon atlas labels every row by data tier. Direct-tier pages carry verified municipal or survey readings wired without regional proxy. Regional proxy rows inherit a parent geography for coverage context. This story summarizes direct-tier verified radon atlas rows by province, using only cities that pass the direct gate. The indoor radon study edition used in City Score still covers 238 communities when regional proxies are included.

Direct-tier averages by province

Saskatchewan’s direct-tier average runs highest among provinces with two cities at 226.7 Bq/m³, driven by Regina at 301.7 Bq/m³ on the atlas row. Manitoba’s single direct city, Winnipeg, reads 256.7 Bq/m³. Alberta’s two direct cities average 124.6 Bq/m³ with Calgary at 135.1 Bq/m³ at the top of that pair. British Columbia averages 68.2 Bq/m³ across four direct cities while Kelowna reaches 135.3 Bq/m³ locally.

Ontario and Quebec direct depth

Ontario carries the widest direct-tier footprint at fifteen cities averaging 104.4 Bq/m³. Kingston at 161.0 Bq/m³ sits above that provincial mean. Quebec lists six direct cities averaging 122.8 Bq/m³, with Sherbrooke at 238.2 Bq/m³ pulling the mean upward. New Brunswick averages 99.9 Bq/m³ across two direct rows. Nova Scotia’s direct set is Halifax at 194.7 Bq/m³. Newfoundland and Labrador lists St. John’s at 94.5 Bq/m³ on one direct row.

Prairie and Atlantic direct rows

Saskatchewan’s Regina reading at 301.7 Bq/m³ on the direct atlas pair anchors the provincial average at 226.7 Bq/m³ across two cities. Manitoba lists Winnipeg alone at 256.7 Bq/m³. Atlantic direct coverage is thinner: New Brunswick averages 99.9 Bq/m³ on two rows, Nova Scotia lists Halifax at 194.7 Bq/m³, and Newfoundland and Labrador lists St. John’s at 94.5 Bq/m³. Those counts explain why the direct-tier map looks sparse outside Ontario and Quebec even though the study ranks 238 communities with proxies.

Atlas direct tier versus study coverage

City Score radon standing comes from the indoor radon study 2025 with coverage_n 238, including regional proxy matches where Health Canada survey geographies attach to hometown slugs. The direct-tier atlas slice in this article is narrower: thirty-three verified city rows summed in the provincial table above, with no proxy inheritance. A city can appear on the study board through proxy while its atlas page still shows a regional label until a direct reading exists.

Readers comparing Calgary on the study (mid-pack at 135.1 Bq/m³) to Regina on the prairie cluster (301.7 Bq/m³ on survey means) should keep tier labels visible on each page. OpenStats publishes community survey context for comparison; household testing still follows Health Canada guidance in ground-contact rooms. Direct-tier provincial averages in this article help atlas editors prioritize verification work where Health Canada survey means already run high in the study edition.

Thirty-three verified rows versus study breadth

The direct-tier atlas slice in this story sums thirty-three verified city rows with no proxy inheritance. The indoor radon study used in City Score still covers 238 communities when regional proxies attach Health Canada survey geographies to hometown slugs. A city can appear on the study board through proxy while its atlas page still shows a regional label until a direct reading exists. Keep tier labels visible when you compare Calgary on the study to Regina on prairie survey means, because atlas direct averages and study ranks answer different coverage questions.

Saskatchewan’s direct-tier average runs highest among provinces with two cities at 226.7 Bq/m³, driven by Regina at 301.7 Bq/m³ on the atlas row. Manitoba’s single direct city, Winnipeg, reads 256.7 Bq/m³. Alberta’s two direct cities average 124.6 Bq/m³ with Calgary at 135.1 Bq/m³ at the top of that pair. British Columbia averages 68.2 Bq/m³ across four direct cities while Kelowna reaches 135.3 Bq/m³ locally.

Ontario and Quebec verification footprint

Ontario carries the widest direct-tier footprint at fifteen cities averaging 104.4 Bq/m³. Kingston at 161.0 Bq/m³ sits above that provincial mean. Quebec lists six direct cities averaging 122.8 Bq/m³, with Sherbrooke at 238.2 Bq/m³ pulling the mean upward. New Brunswick averages 99.9 Bq/m³ across two direct rows. Nova Scotia’s direct set is Halifax at 194.7 Bq/m³. Newfoundland and Labrador lists St. John’s at 94.5 Bq/m³ on one direct row.

Household testing context

OpenStats publishes community survey context for comparison, while household testing still follows Health Canada guidance in ground-contact rooms. Direct-tier provincial averages in this article help atlas editors prioritize verification work where Health Canada survey means already run high in the study edition. Readers comparing direct atlas pages to study ranks should open both surfaces and read tier badges before they quote a single number in local copy.

Pair this desk story with the radon survey study edition article 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. The radon atlas remains the public home for tier disclosure while the study feeds equal-weight composite math on refresh cycles.