Journal of Sustainable Development; Vol. 16, No. 4; 2023 ISSN 1913-9063 E-ISSN 1913-9071 Published by Canadian Center of Science and Education 1 The Effect of Mosque Acoustic Design and the Surrounding Environment on Prayer Health in Riyadh City Post-COVID-19 Hind Abdelmoneim Khogali 1 1 Dar Al Uloom University, CADD-ARC, Riyadh City, Saudi Arabia Correspondence: Dr. Hind Abdelmoneim Khogali, Dar Al Uloom University, CADD-ARC, Riyadh City, Saudi Arabia. Tel: 966-1-1494-9123. E-mail: hind_50abde@yahoo.com Received: April 3, 2023 Accepted: May 3, 2023 Online Published: May 4, 2023 doi:10.5539/jsd.v16n4p1 URL: https://doi.org/10.5539/jsd.v16n4p1 Abstract The Mosques in Saudi Arabia have recently witnessed a remarkable development in audio systems. However, residents complain about the high sound levels. This research aims to measure the sound level and study the factors that affect the noise in the interior and outdoor environment, health and management. The research utilizes a sound measuring device to determine inside and outside mosque noise, distribute a questionnaire to prayers at different times during the day, including at peak times. Three case studies in Riyadh. The result shows that the indoor sound level is above 60 ± 7 dB, which is within the limit. The maximum outdoor value exceeded the 68 ± 20 dB limit, and the minimum outdoor value was 58 ± 18 dB post-COVID-19. The research recommends reducing the level of noise The research results will be applied to manage sound levels inside the mosques using smart devices. Keywords: data analysis acoustic design, mosque, interior space, surrounding outdoor environment, health and management 1. Introduction Loud mosques reduce the ability to hear in the home because of distance. Most residents use mobile devices to track Azan’s time. People who live near the mosques say that the loudspeaker affects their sleep during the day. This dilemma encouraged the researcher to investigate the problem. The literature was reviewed, and several research papers were found discussing the problem, including Makka and Al Haram mosques, as well as studies from Saudi Arabia, Malaysia, Egypt, and Turkia. International studies have indicated increased noise levels in urban societies from multiple sources significantly affecting human life. Noise sources include cars, trains, trucks, airports, mosques, daily human activities, construction activities, and industrial areas [1]. The noise level in the Al-Haram Al-Sharif Mosque in the Sahn area increased to more than 75% decibels, especially at peak times, such as the revival of Laylat al-Qadr on the 27th of Ramadan and the days of the Eids [2]. Three case studies in Al Rawdah, Riyadh, were selected. A survey was distributed to the prayers in three mosques and analyzed to identify the problem and suggest solutions. 1.1 Sound Characteristics  Sound is transferred as waves. It reflects, transmits, and absorbs. Figure 1 shows a sound wave with a 100–1000 Hz frequency.