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　　風(fēng)??(feng)媒??(mei)花??(hua)粉??(fen)指??(zhi)借??(jie)助??(zhu)風(fēng)??(feng)力??(li)傳??(chuan)播??(bo)授??(shou)粉??(fen)的??(de)花??(hua)粉??(fen)??，一??(yi)般??(ban)花??(hua)粉??(fen)粒??(li)小??(xiao)、質(zhì)??(zhi)輕??(qing)、量??(liang)多??(duo)??，如??(ru)柏??(bai)樹??(shu)、楊??(yang)樹??(shu)、柳??(liu)樹??(shu)、樺??(hua)樹??(shu)、梧??(wu)桐??(tong)等??(deng)；它??(ta)的??(de)特??(te)點(diǎn)??(dian)是??(shi)花?(hua)型??(xing)較??(jiao)小??(xiao)、色??(se)淺??(qian)、無(wú)?(wu)香??(xiang)味??(wei)??，數(shù)??(shu)量??(liang)多??(duo)??，花??(hua)粉??(fen)傳??(chuan)播??(bo)面??(mian)積??(ji)很?(hen)廣??(guang)、在??(zai)空?(kong)氣??(qi)中??(zhong)停??(ting)留??(liu)時(shí)??(shi)間??(jian)長(zhǎng)??(chang)??。??　　北??(bei)京?(jing)市??(shi)疾??(ji)控??(kong)中??(zhong)心??(xin)建??(jian)議??(yi)花??(hua)粉??(fen)過(guò)?(guo)敏?(min)者??(zhe)外??(wai)出??(chu)時(shí)?(shi)加??(jia)強(qiáng)?(qiang)防??(fang)護(hù)??(hu)??。??。