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用树木花草装点城市的园林街道,不仅给人以美的感受,还能净化空气、减轻污染,保护环境、增进人民的健康。因此,绿化是现代化城市建设不可缺少的组成部分。空气的天然“净化器”随着工业的发展、人口的增长、森林面积减少,大气中二氧化碳的含量有逐渐增加的趋势。尤其是在人口密集的城市工业区,空气中二氧化碳的浓度甚至可达500—700ppm,而氧气含量却减少了8％左右。这样的地区,如果每人平均有10平方米的绿地,就可以消耗掉一个人呼吸排出的二氧化碳,并供给需要的氧气量。还有人试验,一亩
With trees and flowers decorate the city’s garden streets, not only gives a beautiful feeling, but also purify the air, reduce pollution, protect the environment and enhance people’s health. Therefore, afforestation is an integral part of modern urban construction. Natural air “purifier” With industrial development, population growth, reduced forest area, the content of carbon dioxide in the atmosphere tends to gradually increase. Especially in densely populated urban industrial areas, the concentration of carbon dioxide in the air can even reach 500-700 ppm, while the oxygen content is reduced by about 8%. In such areas, an average of 10 square meters of green space per person can consume the carbon dioxide exhaled by one person and supply the amount of oxygen needed. Some people test, an acre