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Continuous and simultaneous measurements of ammonia gas (NH3) and fine particulate ammonium (PM2.5NH4+) were performed in two distinct urban areas: Osaka, Japan, and Ho Chi Minh City (HCMC), Vietnam. Measurements were performed using a new online instrument. Two measurement periods were conducted during February 11–March 12, 2015 (cold period), and July 1–September 14, 2015 (warm period), at the urban...
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