Indoor and outdoor concentrations of inorganic acidic aerosols and gases
- Harvard Univ., Boston, MA (USA)
Annular denuder-filter pack sampling systems were used to make indoor and outdoor measurements of aerosol strong H{sup +}, SO{sub 4}{sup 2{minus}}, NH{sub 4}{sup +}, NO{sub 3}{sup {minus}} and NO{sub 2}{sup {minus}}, and the gaseous pollutants SO{sub 2}, HNO{sub 3}, HONO and NH{sub 3} during summer and winter periods in Boston, Massachusetts. Outdoor levels of SO{sub 2}, HNO{sub 3}, H{sup +} and SO{sub 4}{sup 2{minus}} exceeded their indoor concentrations during both seasons. Winter indoor/outdoor ratios were lower than during the summer, probably due to lower air exchange rates during the winter period. During both monitoring periods, indoor/outdoor ratios of aerosol strong H{sub +} were 40-50% of the indoor/outdoor SO{sub 4}{sup 2{minus}} ratio. Since aerosol strong acidity is typically associated with SO{sub 4}{sup 2{minus}}, this finding is indicative of neutralization of the acidic aerosol by the higher indoor NH{sub 3} levels. Geometric mean indoor/outdoor NH{sub 3} ratios of 3.5 and 23 respectively were measured for the summer and winter sampling periods. For HONO, NH{sub 3}, NH{sub 4}{sup +} and NO{sub 2}{sup {minus}}, indoor concentrations were significantly higher than ambient levels. Indoor levels of NO{sub 3}{sup {minus}} were slightly less than outdoor concentrations.
- OSTI ID:
- 5383557
- Journal Information:
- Journal of the Air and Waste Management Association; (United States), Vol. 41:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Relationships between indoor and outdoor air quality during summer season in Korea
Source identification and trends in concentrations of gaseous and fine particulate principal species in Seoul, South Korea
Related Subjects
AEROSOLS
AIR POLLUTION MONITORING
GASES
AIR POLLUTION
AMMONIA
AMMONIUM COMPOUNDS
ANIONS
CATIONS
HYDROGEN IONS 1 PLUS
INDOOR AIR POLLUTION
NITRATES
NITRIC ACID
NITROGEN DIOXIDE
NITROUS ACID
SULFATES
SULFUR DIOXIDE
CHALCOGENIDES
CHARGED PARTICLES
COLLOIDS
DISPERSIONS
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN IONS
INORGANIC ACIDS
IONS
MONITORING
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SOLS
SULFUR COMPOUNDS
SULFUR OXIDES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)