How Noxite® reduces NOx Pollution

How Noxite® reduces NOx Pollution

The Noxite® process - from harmful NOx molecules to clean air.

A Noxite® roofing membrane purifies harmful NOx molecules effectively from the air.

At first glance, a Noxite® roofing membrane doesn’t look any different to the quality membranes you are used to from Icopal - a strong and durable capsheet.

Removal of NOx

Noxite® roofing membranes are quite different from all the other products in Icopal’s range. The surface slates/ granules of the Noxite® membranes are coated with titanium dioxide which functions as a catalyst in the process of changing the NOx molecules into harmless levels of nitrates. The process is activated when ultraviolet radiation from the sun hits the titanium dioxide particles, releasing energy for breaking down the NOx molecules. Polluted air passes over the Noxite® membrane where the NOx molecules are converted into harmless levels of water, carbon dioxide and nitrates, which are then washed away by the rain. It is that simple to clean the air, and the best part is that the Noxite® effect lasts for the entire life of the roof.

This innovative roofing solution makes a significant contribution to reducing air pollution by harmful NOx molecules. According to our calculations and in the best conditions, the effect can be quantified as follows : 100 m² of Noxite roofing membrane could purify as much NOx from the air as produced by an average car travelling approx 1,000 miles per year, or A 1,000m² Noxite roof could purify as much NOx from the air as produced by an average car travelling 10,000 miles every year. That's equivalent to travelling from London to Edinburgh and back 15 times. (London – Edinburgh – London = 664 miles).

Investing in people and the environment

A Noxite® roof provides major opportunities for new-build projects or the renovation of existing premises to reduce the effect of NOx pollution. It demonstrates a commitment to invest in people’s health and helps to meet environmental objectives. A bonus is that this “green roofing” membrane does not incur any extra time or effort to install or maintain. The only thing that needs to happen is to cover the roof of the project with a Noxite® membrane and let the rest occur naturally. Using the sun, wind and rain, a Noxite® membrane roof converts polluting NOx into harmless molecules.

Proven Performance

Studies carried out by the CNRS (Centre National de la Recherche Scientifique - French National Scientific Research Centre) show a dramatic reduction in NOx levels attributed to the effect of the Noxite® membrane.

The image below summarises that when NOx gasses are pumped into an air chamber where the Noxite® membrane and a UV light source are present, there is an 89% reduction in the NOx levels over a seven hour period. This compares to only an 8% reduction over the same time period when a standard bitumen membrane is used.


Diagram outline laboratory research carried out by the CNRS (Centre National de la Recherche Scientifique) demonstrating the dramatic NOx reduction effect of Noxite®

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