Observations of new particle formation in urban air

By A. Alam, Ji Ping Shi, R. Harrison. 2003

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Atmospheric new particle formation and growth: review of field observations (2018, background): “NPF event frequencies as low as 5%were reported in Birmingham, United Kingdom (Alam et al 2003) and in Helsinki, Finland (Hussein et al 2008).”
The role of relative humidity in continental new particle formation (2011, background): “[2] It has been observed at different continental locations that new particle formation (NPF) takes place preferentially at low relative humidities (RH) [e.g., Birmili and Wiedensohler ,2 000;Woo et al., 2001; Boy and Kulmala, 2002; Alam et al., 2003; Birmili et al., 2003; Stanier et al., 2004; Hy”
Ambient nano and ultrafine particles from motor vehicle emissions: Characteristics, ambient processing and implications on human exposure (2008, background): “…ternary nucleation can explain observed nucleation rates in urban areas, it does not assist in explaining the rates observed in other environments that do not contain sufficiently high concentrations of sulphuric acid (Weber et al. 1996; Clarke et al. 1998; Yu 2001; Kulmala 2003; Alam et al. 2003).”