The development of Semarang City has an impact on reducing Green Open Space (GOS), decreasing air quality, only having 70 days which is categorized as quite good. The purpose of the study was to evaluate the distribution of GOS and determine the potential need for GOS for air quality control. The method applied is image interpretation to identify the area of GOS, measure air quality conditions at 5 locations in the city of Semarang, calculate the potential of GOS and analyze the need for green open space to reduce air pollution. The area GOS of Semarang City (covering 5 sub-districts) is only 21.6% or 1,109.8 hectares. Central Semarang District has the lowest carbon dioxide (CO2) absorption capacity: only 12% GOS or 14,705 kg/day equivalent to CO2 emitted by 15,318 people (20.65% of the population). As a result, GOS in Central Semarang supplied the smallest amount of oxygen (O2), approximately 18,381.6 kg/day which could be inhaled as many as 14,705 people (19.83% of the population in Central Semarang District). Overall, the city of Semarang is only able to produce O2 of 375,067.2 kg/day. Increasing the plant area in the GOS to 30%, the amount of CO2 absorbed will increase to 59.4% and O2 can be available for 57.02% of the total population in the coastal area of Semarang City.
This paper aims to study carbon monoxide (CO) concentration in schools along Federal Road in Muallim, Perak. The quantitative approach with field survey and sampling methods used for theCO data. A sampling of CO data in Per million (ppm) value using Carbon Monoxide MeterAS8700A for three stations, SMK Khir Johari, SMK Agama Slim River, and SMK Dato Zulkifli Muhammad. The CO was sampling for seven days,with data collection three times a day, from 7:00am - 8:00 am, 9:00 am - 10:00 am, and 12:00 pm - 1:00 pm. This study applies a descriptive analysis.The results showthe lowest level of CO concentration was in SMK Agama Slim River, which is 0ppm, and the highest, which is 3.7 ppm. Meanwhile, the lowest CO level in SMK Dato Zulkifli Muhammad is 2.3 ppm, and the highest level is 5.7 ppm. The lowest CO concentration level in SMK Khir Johari is 2.3 ppm, and the highest is 4.3 ppm. The results show that the SMK Dato Zulkifli Muhammad recorded the highest CO concentration, 3.92 ppm higher than SMK Khir Johari, which recorded 3.57 ppm. SMK Agama Slim River is the lowest CO concentration station which is 1.62 ppm. In conclusion, transportation activities involving motor vehicles influenced the CO concentrations obtained by the researchers. For the implication, effective measures should be taken at the school near major roads to curb CO gas poisoning, ensure life comfort, and preserve the environment.
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