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烟雾和小雨都是常见的天气现象,但两者对人体健康的影响却有所不同。严格地说,烟雾是烟幕和雾这两种现象的合称。烟和雾有时在视觉上很难区分,都表现在能见度只有几千米或几百米。气象上,区分烟和雾的标准是空气湿度。一般空气相对湿度大于80%时才有可能出现雾。烟幕是大气遭受污染的标志之一。正常情况
Smog and light rain are common weather phenomena, but their effects on human health are different. Strictly speaking, smoke is the combination of the two phenomena of smoke and fog. Smoke and fog sometimes visually difficult to distinguish, are reflected in the visibility of only a few kilometers or a few hundred meters. Weather, the distinction between smoke and fog is the standard air humidity. General air relative humidity greater than 80% may occur when the fog. Smoke screen is one of the signs of pollution of the atmosphere. normal circumstances