Pollution Sources and causes
Air pollution comes from both natural and man made sources. Though globally man made pollutants from combustion, construction, mining, agriculture and warfare are increasingly significant in the air pollution equation.
Motor vehicle emissions are one of the leading causes of air pollution. China, United States, Russia, Mexico, and Japan are the world leaders in air pollution emissions. Principal stationary pollution sources include chemical plants, coal-fired power plants, oil refineries, petrochemical plants, nuclear waste disposal activity, incinerators, large livestock farms (dairy cows, pigs, poultry, etc.), PVC factories, metals production factories, plastics factories, and other heavy industry. Agricultural air pollution comes from contemporary practices which include clear felling and burning of natural vegetation as well as spraying of pesticides and herbicides
About 400 million metric tons of hazardous wastes are generated each year. The United States alone produces about 250 million metric tons. Americans constitute less than 5% of the world's population, but produce roughly 25% of the world’s CO2, and generate approximately 30% of world’s waste. In 2007, China has overtaken the United States as the world's biggest producer of CO2
污染源和原因
空气污染来自于自然和人为来源。虽然从全球人造燃烧，建筑，采矿，农业和战争污染物空气污染日益方程显着。
机动车排放是造成空气污染的主要原因之一。中国，美国，俄罗斯，墨西哥和日本是世界上空气污染排放的领导人。固定污染源主要包括化学工厂，燃煤电厂，炼油厂，石化厂，核废物处置活动，焚烧炉，大牲畜养殖场（奶牛，猪，家禽等），聚氯乙烯厂，金属生产厂，塑料工厂等重工业。空气污染来自农业，其中包括明确的砍伐和自然植被燃烧以及喷洒农药和除草剂的当代实践
约400万公吨的危险废物每年产生。仅美国生产约250万公吨。美国人占不到5％的世界人口，但产生大约25世界的二氧化碳％，并产生约30世界的浪费％。 2007年，中国已经超过美国成为世界上最大的二氧化碳生产国美国
温馨提示：答案为网友推荐，仅供参考