Table 2.

The Total Amount and Main Types of Airborne Sensitized Pollen in 1984, Xi ‘An

Regions	Total Pollen Count	Pollen Species	Main pollen Species (Ranked from Highest to Lowest Percentage)
South suburb of Xi ‘an	8104	31 families, 32 genera, 44 species	Platanus (23.47%) Asteraceae Artemisia (22.83%) Poplar of salicaceae (12.59%) Cupressaceae (3.78%) Poaceae (2.83%) Broussonetia (2.53%)
Southwest of Xi ‘an	8390	23 families, 27 genera, 32 species	Corylus (20.73%) Cupressaceae (14.97%) Asteraceae Artemisia (9.24%) Platanus (7.40%) Poplar of salicaceae (7.29%) Chenopodiaceae (5.90%)