Investigation of Variations in Suspended Particulate Matter with Enforcement of Regulations on Diesel Vehicle Exhaust in Suburban Japan

Air pollutant deposition effect and morphological change ofCryptomeria japonicapollen during its transport in urban and mountainous areas of Japan

“…Some exposure experiments of pollens to air pollutants in the roadside (Jiang et al [11]) and laboratory and morphological analysis by an electron microscope are carried out, and ionic and elemental analyses of the pollen grains collected in urban and mountainous areas of Saitama, Japan are performed.…”

Chemical Characterization of Water-Soluble Organic Acids in Size-Segregated Particles at a Suburban Site in Saitama, Japan

“…In the protocol, a 0.503-cm 2 punch aliquot of a sample quartz filter was heated at temperatures of 120� C (OC 1 ), 250� C (OC 2 ), 450� C (OC 3 ), and 550� C (OC 4 ) in a non-oxidizing helium atmosphere, and at 550� C (EC 1 ), 700� C (EC 2 ), and 800� C (EC 3 ) in an oxidizing atmosphere of 2% oxygen and 98% helium. The repeatability, determined from replicate analyses, was better than 5% for total carbon (TC) and 10% for OC and EC (Jiang et al, 2006).…”

“…Atmospheric samples of suspended particulate matter (SPM) were collected at Saitama University, located in a suburban area of Saitama, about 30 km to the northwest of central Tokyo and about 4 km to the east of the business center of Saitama City, which has a population of more than one million (Jiang et al, 2006). The sampling site was located on top of a 10-story office building at the University, and about 37 m above the ground level to avoid possible interference from local emission sources.…”

Contribution of airborne fine particles containingCryptomeria japonicapollen allergens to airborne organic carbonaceous aerosols during a severe pollination episode

“…In our laboratory, we checked that Japanese cedar pollen allergen Cry j 1 contents are eluted by contacting the rain water, so Cry j 1 particles are possible to release from exfoliated Ubisch bodies of Cryptomeria japonica pollen grains, released pollen content and eluted Cry j 1 by rain and so on. Since the major allergen Cry j 1 particles can be released to the atmosphere as respirable-sized particles, and the size distribution is even similar with the particles emitted from some anthropogenic sources such as diesel exhaust particles (DEP) (Jiang et al [11]) and secondary formation particles, it was supposed that these pollen allergen particles may be modified by the combination and/or reaction with some air pollutants during airborne transportation. …”