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1、Recentresearchhasclaimedthatanexcessofpositiveionsintheaircanhaveanilleffectonpeople'sphysicalorpsychologicalhealth.Whatarepositiveions？Well，theairisfullofions，electricallychargedparticles，andgenerallythereisaroughbalancebetweenthepositiveandthenegat
2、ivecharged.Butsometimesthisbalancebecomesdisturbedandalargerproportionofpositiveionsarefound.Thishappensnaturallybeforethunderstorm，earthquakeswhenwindssuchastheMistral，HamsinorSharavareblowingincertaincountries.Oritcanbecausedbyabuild-upofstaticelec
3、tricityindoorsfromcarpetsorclothingmadeofman-madefibres，orfromTVsets，duplicatorsorcomputerdisplayscreens. Whenalargenumberofpositiveionsarepresentintheairmanypeopleexperienceunpleasanteffectssuchasheadaches，fatigue，irritability，andsomeparticularlyse
4、nsitivepeoplesuffernauseaorevenmentaldisturbance.Animalsarealsoaffected，particularlybeforeearthquakes，snakeshavebeenobservedtocomeoutofhibernation，ratstofleefromtheirburrows，dogshowlandcatsjumpaboutunaccountably.ThishasledtheUSGeographicalSurveytofun
5、danetworkofvolunteerstowatchanimalsinanefforttoforeseesuchdisastersbeforetheyhitvulnerableareassuchasCalifornia. Conversely，whenlargenumbersofnegativeionsarepresent，thenpeoplehaveafeelingofwell-being.Naturalconditionsthatproducetheselargeamountsaren
6、earthesea，closetowaterfallsorfountains，orinanyplacewherewaterissprayed，orformsaspray.Thisprobablyaccountsforthebeneficialeffectofaholidaybythesea，orinthemountainswithtumblingstreamsorwaterfalls.examda.com Toincreasethesupplyofnegativeionsindoors，som
7、escientistsrecommendtheuseofionisers：smallportablemachines，whichgeneratenegativeions.Theyclaimthationisersnotonlycleanandrefreshtheairbutalsoimprovethehealthofpeoplesensitivetoexcesspositiveions.Ofcourse，therearethedetractors，otherscientists，whodismi
8、sssuchclaimsandareskepticalaboutnegative/positiveionresearch.Thereforepeoplecanonlymakeuptheirownmindsbyobservingtheeffectsonthemselves，oronothers，ofanegativerichorpoorenvironment.Afterallitisdebatablewhetherdependingonseismicreadingstoanticipateeart
