Measurements of PM10 aerosol and gas-phase nitrous acid during fall season in a semi-urban atmosphere

Observations of high rates of NO<sub>2</sub>-HONO conversion in the nocturnal atmospheric boundary layer in Kathmandu, Nepal

“…It is necessary to separate HONO formed by chemical reactions from HONO that is directly emitted (mainly from vehicles; the contribution from industrial combustion processes is not clear This maximum ratio of 30% is substantially higher than the previously observed ratios at other urban and suburban sites in Europe, North America and Asia (i.e., 1-12% reported by Lammel and Cape (1996), 19% reported by Wang et al (2003) during dust storms, and 1-13% around Asia - Qin et al, 2006;Park et al, 2004;Hao et al, 2006).…”

Photochemical Air Pollution of Seoul in the Last Three Decades

“…NO x 의 농도가 높은 경우 HNO 3 의 생성 에 의한 표층으로의 침적이나 입자상으로의 변환은 O 3 생성 효율을 감소시킨다 (Jacob, 1999 (Jung, 2013;Park et al, 2004). HONO는 광분해 되어 OH기 를 생성하는데 도시에서는 이른 아침 OH기의 주요 생성원 역할을 한다 (Jacobson, 1999).…”

Development of Semicontinuous Measurement System of Ionic Species in PM2.5

“…The PCEs were almost 100% at different concentration levels in the range over 500 nm in diameter but 50-90% in the range of 50-500 nm under the following experimental conditions: 15 coil turns, a water flow rate for steam generation of 0.65 mL min -1 , and an air sample flow rate of 16.7 L min -1 . This technique was applied to field measurements of the chemical compositions of PM2.5 during January [11][12][13][14][15][16][17][18][19][20][21][22][23][24]2006, at Yonsei University in Seoul, Korea. The results indicated that SO4 2− and NH4 + in PM2.5 were present at high levels from January 15 to 19.…”

“…The coating solution was prepared according to the use and maintenance manual for URG annular denuders. [21][22] Particle collection section. Figure 1 shows a schematic diagram of the measurement system and Figure 2 displays important components of the particle collection section (mixing part, particle collection chamber, and air/liquid separator) made of Pyrex glass.…”

“…Finally, for atmospheric applications, chemical compositions of PM2.5 were determined with a time resolution of 20 min on January [11][12][13][14][15][16][17][18][19][20][21][22][23][24] 2006 in Seoul, Korea, and the chemical characteristics of PM2.5 ions were investigated.…”