Noise is considered as one of the challenging problems in big cities. However, this noise could be utilized in producing energy especially in dense urban areas. Sound as a form of mechanical energy, it can be converted to electric energy through many approaches including heating, by using the diaphragm and through using piezoelectric materials. This research aims at utilizing noise through using piezoelectric materials as an approach of conversion to produce green sustainable electric energy that can be used to decrease the energy consumption from non-renewable sources and utilizing this energy in street lighting. The study was carried in three bus stations in Alexandria by having measurements during weekdays and weekends in order to study the noise produced in the selected stations and the amount of electric energy that could be produced and utilized in street lighting. The noise level index L DEN was calculated for each of the three selected locations. The equivalent noise level values were always exceeding the limits through the day, evening and night. At daytime they ranged between 75–85 dB which is higher that the permissible limit by 10–20 dB, at evening they ranged from 80–85 dB which is also higher than the permissible limit with 20–25 dB and at the night they ranged from 75–80 dB which is higher by 20–25 dB than the permissible limit. The research concluded that utilizing noise using the piezoelectric material is successful. The electric energy produced from an area of 1.45 m2 containing 690 piezoelectric QB220-503YB transducers at each of the selected stations was about 0.024 watt hr. This amount of electric energy is too small to be used in an application. So the application area should be maximized to hundreds of square meters to produce beneficial electric energy that can be used in lighting 1 LED street lamp or it can be stored and used when needed in applications that use greater amount of electric energy and this would help in reducing the energy consumed.

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Throughout history, pandemics affect cities and their shapes, many health problems have been reflected in urban planning. Today, the world faces a general health crisis of COVID-19. The number of people infected by the virus and the increasing number of deaths may result in the city-design strategies. The effect of this pandemic shows the importance of urban design and its effect on viral infections and its role in the health of populations, but this relationship is unclear and ignored; that is why we face this pandemic today. In this study, we are looking to protect the environment and human health by enhancing air quality by designing a new urban space in crowded cities called 'City Lung' and green roofs to reduce the effect of air pollutions. Moreover, cleaning the air inside high-density districts by controlling pollution sources was a vital link observed between the lockdown and the reduction of CO2 emissions during the COVID-19 pandemic. This paper will start by searching for a crowded study area with high traffic density, study the impact of urban form and air quality effects on human health, and suggest solutions to this study area. In the beginning, ENVI-MET 4.4.5 software was used to simulate the carbon emission values and validate these values by CI-340 lightweight hand-held photosynthesis system device to get readings to evaluate the urban air quality and its effect. The present study reveals that algae stations improved the oxygen ratio 1.65 times in the study area than the existing values. Also, green roofing as a solution effectively affects air quality near the ground, as an alternative for the green areas in crowded cities and pedestrians areas. This study enables urban planners to determine more greening principles for better urban living environments in high-density cities. Finally, the results give guidelines on improving air quality in the surrounding environment to enhance the quality of life.

Worldwide, governments set their strategies, policies, and regulations to develop affordable houses based on their local low/middle-income categories' demands. However, affordable housing is directly affecting the housing development process. Some countries do not put this into consideration. This paper has a main aim which is the creation of a checklist to evaluate the affordability of the housing projects so as to evaluate a recent affordable housing project with a comparison between old projects in Egypt. In a national view, Egypt, the supplied unit increased to 500,000 units with only 188,697 occupied units. This represents 37.7% of the supplied units. According to "CAPMAS 2017", there are 13 million housing units which are not used in Egypt. Therefore, the researcher had to choose qualitative, quantitative, analytical and field methodology to prove the aim of the paper. However, during the recent years the government of Egypt created a housing project named Bashayer Al-Khair, as a first step of the future strategy to create more projects of Bashayer Al-Khair 2, 3. This project was selected to be the case study of the paper in order to evaluate its affordability because it is the first step of many more affordable housing projects to come. Thus, a questionnaire was conducted on 50 local households. Accordingly, the results proved that 77% of the local households are not satisfied with the housing while 22% find that the housing units are not financially affordable. Hence, that results show a high percentage of failure in affordability.