而硫酸盐微粒方案只能在短暂的几年内有效。
Sulphate particles, meanwhile, survive only a few years in the atmosphere.
1991年，菲律宾的品纳士玻火山爆发不到一年，上层大气中的自然硫酸盐微粒就使全球气温降低了0.5摄氏度。
Natural sulphate particles in the upper atmosphere lowered global temperatures by 0.5 degrees Celsius in less than a year following the eruption of Mount Pinatubo in the Philippines in 1991.
在那里，气态硫转化为可以反射阳光并令地球冷却的硫酸盐悬浮微粒。
There, the sulfur gas transforms into a sulfate aerosol that reflects sunlight and cools the planet.
据世界卫生组织称，微粒物的主要成分为硫酸盐、硝酸盐、氨、氯化钠、碳、矿物性粉尘和水。
According to the World Health Organization, the main components of particulate matter are sulfate, nitrates, ammonia, sodium chloride, carbon, mineral dust and water.
据世界卫生组织称，微粒物的主要成分为硫酸盐、硝酸盐、氨、氯化钠、碳、矿物性粉尘和水。
According to the World Health Organization, the main components of particulate matter are sulfate, nitrates, ammonia, sodium chloride, carbon, mineral dust and water.
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