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Cost-Benefit Analysis of Smog-Eating Tiles. Ben Bahlenhorst Zheng Fu Joe Hill Ian Laird Long Nguyen Binh Phan. Introduction. Smog-Eating Tiles: Compostable tiles created by Boral that absorb smog in areas that harbor large quantities of inhabitants.

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Cost benefit analysis of smog eating tiles

Cost-Benefit Analysis of Smog-Eating Tiles

Ben Bahlenhorst

Zheng Fu

Joe Hill

Ian Laird

Long Nguyen



  • Smog-Eating Tiles:Compostable tiles created by Boral that absorb smog in areas that harbor large quantities of inhabitants

  • Purpose:inform the reader about the costs and benefits of smog-eating tiles in areas that have high levels of smog

  • Benefits the environment, and human health in densely populated metropolises

How they work
How They Work

  • Tiles are coated with titanium dioxide

  • In sunlight, the titanium dioxide reacts with the nitrogen oxides, which breaks them down into calcium nitrate:

    TiO2 + NOx + Sunlight = Ca(NO3)2

  • Calcium nitrates do not harm human health. These substance are left on tiles, and washed off when it rains


  • Initial costs average about 25% more than traditional tiles

  • Installation costs do not differ from traditional tiles

  • Removal costs are also the same, but transportation to a recycling facility add additional costs


  • Local government should provide tax cuts to those who purchase smog eating roofs

  • A tax on traditional roof tiles and maintenance will pay for the tax incentive

  • This makes smog eating tiles the cheaper option


  • Reduced smog pollution in densely populated areas

  • Nitrates: great for surrounding plant life

  • Keeps homes warm in the winter and cool in the summer

  • Human health will increase considerably


  • Compostable materials are durable

  • Tiles last for an average of 25 years before they need to be replaced

  • Half as long as traditional tile life


  • Need to be replaced just as

    wood or asphalt

  • However, concrete tiles are replaced less often

  • They will not clog landfills like other roofing materials

  • Tiles can be recycled and made into new tiles, or infrastructure

  • They benefit the environment


  • Benefits outweigh the costs

  • Smog level reduction creates a healthier environment and inhabitants

  • Tiles reduce home heating and cooling costs

  • Recyclable tiles mitigate the amount of landfill waste

Works cited
Works Cited

  • Benefits of concrete roofing tile recycling. (2008, October 20). Retrieved from

  • Emission Standards Reference Guide. Retrieved from

  • Levinson, R. (2007). Cooler tile-roofed buildings with near-infrared-reflective non-white coatings. Building and Environment, 42(7), doi:

  • Palmer, J. (2011, November 12). 'smog-eating' material breaking into the big time. Retrieved from

  • Peters, J. (2011, February 1). Los angeles homes going green with smog-eating roof tiles. Retrieved from

  • Renowden, J. (2012, July 19). Smog-eating tile: A real-world product for reducing the harmful health effects of contaminated air. Retrieved from

  • Renowden, J. (2011, July 12). Smog eating tile with boralpure™ technology. Retrieved from

  • Titanium dioxide used to reduce no levels in. (2011, April 1). Retrieved from[email protected]&vid=2&hid=5

  • Verwymeren, A. (2011, September 12). Smog-eating tiles may make pollution a thing of the past. Retrieved from

  • What is photocatalyst. (2012). Retrieved from