Photocatalytically active building materials can contribute to better air quality by mineralizing the hazardous nitrogen oxides to nitrate. Evaluation of these materials is very important for optimization and implementation at target sites. However, the currently widely used ISO 22917-1:2016 test is unsuitable to estimate the effect on real scenarios since it employs too high concentrations and only evaluates the NO oxidation potential, completely ignoring the more relevant NO₂. Herein, we present a methodology to better simulate the real-world performance of these materials based on its effect on the ternary mixture NO/NO₂/O₃ under environmentally relevant concentrations, which can also be simulated by means of kinetic analysis of experimentally less complex single component measurements. From this, a new figure of merit - the trend value - is derived to rate the materials' performance.

具有光催化活性的建筑材料可通过将有害的氮氧化物矿化成硝酸盐来改善空气质量。这些材料的评估对于目标站点的优化和实施非常重要。但是，当前广泛使用的ISO 22917-1：2016测试不适用于估计对真实场景的影响，因为它使用的浓度太高，并且仅评估NO氧化电位，而完全忽略了更相关的NO ₂。本文中，我们提出了一种方法，根据其对三元混合物NO / NO ₂ / O _3的影响，可以更好地模拟这些材料的实际性能在与环境有关的浓度下，也可以通过对实验上较简单的单组分测量进行动力学分析来模拟。由此得出了一个新的品质因数-趋势值-来评估材料的性能。