CSIRO's 1998 indoor-air estimate: the source behind the $12 billion figure

The historical source

The often-repeated Australian indoor-air figure of up to $12 billion a year is a 1998 estimate, attributed to S. K. Brown in a CSIRO press release. It is not a new Simply Maid study or an estimate of today's costs.

The Australian Government's Indoor air reference page identifies the source as Brown, S. K. (1998), Beating the $12 Billion Cost of Polluted Air, CSIRO press release, reference 98/55. That government page was last updated in October 2021; its later publication date does not update the underlying estimate.

Read the archived Healthy Interiors page

Healthy Interiors previously hosted a copy under its indoor-air articles. The 9 April 2017 Wayback capture preserves that historical page. The capture date tells you when the page was archived, not when CSIRO made the estimate.

If you arrived from a renovation guide, clean-air publication or building-materials article, this is the reference those older links were seeking. Use the government bibliography to identify the release and the archive to inspect the former page. Archive availability can vary.

What the figure can and cannot tell you

The release concerns the economic burden associated with polluted indoor air, including illness and lost productivity. Its scope is broader than homes: it is not a bill for domestic cleaning, a price for treating one building, or a forecast of savings from booking a cleaner.

Three distinctions matter when using it:

1. An estimate is not an invoice. The figure describes an estimated economic burden. It does not show what an individual household spent.
2. A later citation is not a newer study. A document published recently can still cite the same 1998 source. Check the underlying year before describing a number as current.
3. A press release is not a complete calculation workbook. These records do not provide a reproducible modern model for us to recalculate. We have not adjusted the number for inflation, population or changes in buildings.

When citing it, keep the organisation, year and qualification together: a 1998 CSIRO estimate of up to $12 billion annually. For a current economic claim, seek newer research with a stated method and observation period instead of reusing this figure as today's total.

From the historical reference to practical home care

The figure does not tell you which action your own home needs. A useful starting point is to distinguish a cleaning task from a moisture, ventilation or building-maintenance issue. Our indoor-air guide explains that decision, with links to current guidance and the existing dust and mould guides.

For a room-by-room starting point, visit Healthy Home. For the former site's book and checklist references, use Healthy Home Resources.

Research responsibility and methods

This page is an original bibliographic explanation prepared with AI assistance for Simply Maid on 14 October 2026. We checked the Australian Government citation and recovered Healthy Interiors archive. We did not conduct an economic study, inspect a property, independently validate the 1998 calculation or obtain CSIRO endorsement. The archived release is linked, not reproduced in full.

Simply Maid now publishes this replacement resource. The former Healthy Interiors site's authors and services remain distinct from Simply Maid. Send a source correction through Get help; include the document title, year and relevant passage.