那么怎樣(yang)的(de)空(kong)(kong)(kong)氣(qi)才(cai)(cai)是(shi)健(jian)(jian)康(kang)的(de)？根(gen)據世界衛生組織規定，負氧離(li)子(zi)濃(nong)(nong)(nong)(nong)度(du)在1000個/cm3以上可滿足(zu)健(jian)(jian)康(kang)基本需要，若低于1000/cm3個以下則可視(shi)為空(kong)(kong)(kong)氣(qi)被污染，濃(nong)(nong)(nong)(nong)度(du)在1000~1500個/cm3的(de)空(kong)(kong)(kong)氣(qi)被視(shi)為清新的(de)空(kong)(kong)(kong)氣(qi)，濃(nong)(nong)(nong)(nong)度(du)高于1500個/cm3的(de)空(kong)(kong)(kong)氣(qi)才(cai)(cai)能(neng)被稱為是(shi)健(jian)(jian)康(kang)空(kong)(kong)(kong)氣(qi)。也就(jiu)是(shi)說富含(han)高濃(nong)(nong)(nong)(nong)度(du)負氧離(li)子(zi)的(de)空(kong)(kong)(kong)氣(qi),才(cai)(cai)是(shi)健(jian)(jian)康(kang)的(de)空(kong)(kong)(kong)氣(qi)。

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以(yi)國際著(zhu)名的(de)廣西巴馬(ma)長(chang)壽村為例(li)，研究表明，巴馬(ma)長(chang)壽老人比較多的(de)原(yuan)因，與當(dang)地空氣負離(li)子含量(liang)很高有關(guan)。

巴(ba)馬當(dang)(dang)地(di)的空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)大(da)多是由針葉(xie)植物(wu)的葉(xie)子(zi)在光(guang)電(dian)效應下，發生尖端放(fang)電(dian)而產(chan)生。針葉(xie)植物(wu)的葉(xie)子(zi)作為空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)的發生尖端，源源不斷向外釋放(fang)空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)，而空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)的壽命很短，只(zhi)有1~2分(fen)鐘（環境(jing)惡劣的地(di)方(fang)只(zhi)有幾(ji)秒鐘），無法由風力來輸送。由此說來，當(dang)(dang)地(di)的人想要(yao)(yao)長壽的話(hua)，難道都需要(yao)(yao)靠近(jin)植物(wu)1~2米(mi)來主(zhu)動呼吸空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)嗎？當(dang)(dang)然(ran)不是，廣(guang)西巴(ba)馬的空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)活性非常高，能夠快速的擴散出(chu)去，在巴(ba)馬上空(kong)(kong)(kong)形成了(le)一個龐大(da)的空(kong)(kong)(kong)氣(qi)負(fu)離子(zi)浴(yu)環境(jing)，造(zao)就了(le)當(dang)(dang)地(di)居民的長壽。

由此可以證明，只有活(huo)性(xing)高(gao)、遷(qian)移距離遠的負離子(zi)(zi)，也就是生態負氧離子(zi)(zi)，才能(neng)發(fa)揮其(qi)良(liang)好的生物(wu)活(huo)性(xing)，穿透(tou)人體血腦屏障，發(fa)揮療效。