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London maintains an emissions limit of 40 micrograms per cubic meter of nitrogen dioxide.—Jasmin Malik Chua, Sourcing Journal, 5 Feb. 2026 Most adults need about 900 micrograms of copper per day.—Zia Sherrell, Health, 5 Feb. 2026 The ideal intake should be 400 micrograms a day, which can help reduce your risk of stroke and cardiovascular disease, according to Saba.—Mara Santilli, Flow Space, 5 Feb. 2026 In October, the Air District lowered the threshold of fine particulate matter for declaring Spare the Air alerts from 35 to 25 micrograms per cubic meter.—Carlos E. Castañeda, CBS News, 4 Feb. 2026 See All Example Sentences for microgram