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10 −1 g dg decigram 10 1 g dag decagram 10 −2 g cg: centigram: 10 2 g hg hectogram 10 −3 g mg: milligram: 10 3 g kg: kilogram: 10 −6 g μg: microgram (mcg) 10 6 g Mg megagram 10 −9 g ng: nanogram: 10 9 g Gg gigagram 10 −12 g pg picogram 10 12 g Tg teragram 10 −15 g fg femtogram 10 15 g Pg petagram 10 −18 g ag attogram 10 18 g Eg ...
A 1942 ad encourages women to smoke Camel brand cigarettes. The widespread smoking of cigarettes in the Western world is largely a 20th-century phenomenon. By the late 19th century cigarettes were known as coffin nails [ 13 ] but the link between lung cancer and smoking was not established until the 20th century. [ 14 ]
In 2002, it was estimated that half of the drinking water was polluted with arsenic, exceeding levels of 10 micrograms per litre. [262] Bangladesh is crippled with one of the worst air qualities in the world, mostly concentrated in the densely populated urban areas, especially the capital Dhaka and its metropolitan area . [ 263 ]