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There are many ideas and applications for incorporating nature into buildings to improve the quality of the indoor air and to achieve a higher percentage of natural ventilation with pollution reduction. One such idea is to use the Breathing Walls "BW" built on porous materials. The energy used in air-conditioned buildings is reduced by these materials. BW suggests a conceptual design suitable for hot climates and capable of controlling airflow across the entire surface and refrigerating internal spaces in various cooling ways. BW forming all or part of an air-permeable building envelope or exterior provide a comprehensive solution to the severe issue of self-inflicted environmental harm that many cities now face. BW are the walls that have pores inside them and can diffusion water vapor and helping to get rid of moisture and raise indoor air quality (IAQ). In both social and economic contexts, IAQ is a significant issue. The definition of breathing walls, their characteristics, and the environmental problems solved using BW will be discussed in this paper, as well as their impact on the improvement of the indoor air quality.

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This paper presents an experimental study of performance of water stirring solar still. The Conventional Solar Still (CSS) has been modified, developed and tested to enhance the performance by using water stirring method. This modification was performed by fixing a mechanical wiper on the bottom of still basin. The experimental results on the modified solar still were analyzed and compared with that of conventional solar still (CSS) that has the same basin area, dimensions, water depth and operating conditions. Results showed that, the accumulated productivity from the water stirring solar still (WSSS) ranges from 3.27 to 3.82 L/m 2 per day at water depth of 2 cm. The corresponding values for (CSS) range from 3.0 to 3.5 L/m 2 per day. The increasing in productivity for WSSS is about 9.14 % more than that of the CSS.