大气颗粒物的来源分为两类：一类是自然源；另一类是人为源。自然源主要包括：岩石土壤风化、森林大火、火山爆发、流星雨、沙尘暴、海盐粒子、植物花粉、真菌孢子、细菌体，以及各种有机物质的自燃过程等。人为源主要包括：汽车尾气排放、摩托车尾气排放、火车机车排放、飞机尾气排放、轮船排放、工业窑炉排放、民用炉灶排放、农用拖拉机排放、工业粉尘、交通道路扬尘、建筑工地扬尘、裸露地面扬尘、烹饪油烟、街头无序烧烤、垃圾焚烧、农田秸秆焚烧、燃放烟花爆竹、寺庙香火和烟民抽烟等。在大气颗粒物中，细颗粒物主要来自化石燃料和生物质的燃烧过程。专家们认为细颗粒物是导致北京地区雾霾灾害天气频繁出现的最主要因素。汽车尾气排放大量的空气污染物。有车族对北京市严重的大气污染和雾霾灾害的形成，负有首要责任。有车族，少开车，或者不开车，是解决目前北京严重的大气污染，阻止雾霾灾害天气频繁出现的根本出路。%The sources of the particulates in the atmosphere may be put in two kinds: One of which is called natural source, and another is called anthropogenic source. The major natural sources include forest fire, volcanic eruption, sand and dust storm, flying dust on the earth’s surface, sea salt particles, plant pollens, plant spores, germ bodies, and self-burning process of organic substance in the natural world, etc. The major anthropogenic sources include: automobile exhaust, motor exhaust, train engine, airplane exhaust, steamboat exhaust, industrial boilers, Stoves and furnaces of civil uses, tractor exhaust, industrial dust, dust from highways, dust from construction sites, dust from uncovered lands, oil and smoke from cooking, barbecue on the streets, refuse incineration, burn of agricultural straw, set off firecrackers, burning joss sticks in the temples and smoking of smoking persons, and so on. The fine particles in the atmosphere are mainly from combustion of fossil fuels and organic substances. Now the fine particles in the air in Beijing are mainly from exhaust of the 5.20 million cars.
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