Accessibility

We target WCAG 2.2 Level AA. We do not claim perfect conformance, because a site of 4,000 generated pages will always have edge cases we have not seen. Where we fall short we would rather hear about it and fix it than publish an unqualified claim.

• Every page works without JavaScript. The maps, tables, data and navigation are all server-rendered; JavaScript adds tooltips and a theme toggle, and nothing essential depends on it.
• A skip link to the main content is the first focusable element on every page.
• Semantic headings in order, real table markup with scoped headers, and landmarks for header, navigation, main and footer.
• Visible focus outlines on every interactive element, in a colour that meets contrast against both themes.
• The county search is a proper combobox: arrow keys move through results, Enter opens one, Escape and Tab leave it.
• Text is never colour alone. Radon zones carry a number as well as a colour, and air quality categories are named as well as shaded.
• prefers-reduced-motion is respected: the page-load reveal and every transition are disabled when you ask for that.
• Light and dark themes are both designed for contrast, and the site follows your system setting unless you override it.
• No auto-playing media, no carousels, no timed content, and no modal that appears without you asking for it.

The radon zone colours were chosen so that Zone 1 and Zone 3 remain distinguishable under the common forms of colour vision deficiency, because red-green is exactly the pairing a naive risk palette reaches for first. Every map on this site is accompanied by a table containing the same data as text, and no information is available only from a map.

• Wide data tables scroll horizontally inside their own container on narrow screens. The container is keyboard-scrollable, but a very wide table is still awkward on a phone.
• Map tooltips appear on hover and are not reachable by keyboard. Everything they contain is also in the table below the map, which is fully accessible.
• Some source data uses terminology we cannot change without misquoting the agency that published it.

If something here does not work with your screen reader, magnifier, switch device or keyboard, email admin@lung.com with “accessibility” in the subject. Tell us the page and what happened, and we will fix it and reply. If you need a figure from a page you cannot use, ask and we will send it to you directly.