Pengaruh Jumlah Kendaraan Dan Faktor Meteorologis (Suhu, Kelembaban, Kecepatan Angin) Terhadap Peningkatan Konsentrasi Gas Pencemar No₂ (Nitrogen Dioksida) Pada Persimpangan Jalan Kota Semarang

Every day, the number of vehicles on the road is increasing. It will cause increasing of pollutant gases. According to Soedomo (2001) as an overview, transportation sector accounted for 69% of NO2 pollution in urban areas, followed by industry and households. According to Fardiaz (1992) NO2 concentrations in the air of a city varies throughout the day depending on sunlight and vehicles activity. NO2 concentrations are also influenced by meteorological factors, it's temperature, humidity, and wind speed. Karangrejo Raya street, Sukun Raya street, Ngesrep Timur V street of Semarang is located at the intersections in Banyumanik. Karangrejo street and Sukun Raya street are center of activity because it is a populated residential area, while Ngesrep Timur V street is a center of educational facilities because there are several universities are located in this region. The method used is sampling directly at the site when the rush hour of vehicles in the morning (7:00 to 08:00), noon (13:00 to 14:00), and afternoon (16:00 to 17:00) for 12 days each 3 days row at Karangrejo Raya street, Sukun Raya street, and Ngesrep Timur V street and the last 3 days compared every other street using impinger and anemometer. Based on the research that has been analyzed, the concentration of NO2 at Karangrejo Raya street ranged from 0.7 to 4.2 mg / Nm3, the concentration of NO2 at Sukun Raya street ranged from 1.0 to 4.1 mg / Nm3, while the concentration of NO2 on the Ngesrep Timur V ranged from 0.2 to 1.7 mg / Nm3. It shows that the concentration of NO2 in three sreets are far below the quality standard