microgram

[ mahy-kruh-gram ]

/ ˈmaɪ krəˌgræm /

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noun

a unit of mass or weight equal to one millionth of a gram, used chiefly in microchemistry. Symbol: μg

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Which of the following nouns has an irregular plural form?

Also especially British, mi·cro·gramme .

Origin of microgram

First recorded in 1885–90; micro- + -gram²

microgram²

[ mahy-kruh-gram ]

/ ˈmaɪ krəˌgræm /

noun

New York’s subway system had an average fine particle concentration of 548 micrograms per cubic meter.
Air pollution in US subway stations is disturbingly high|Kate Baggaley|February 11, 2021|Popular-Science
Gordon and his colleagues found that the PATH system had the highest levels of pollution, with an average particle concentration of 779 micrograms per cubic meter.
Air pollution in US subway stations is disturbingly high|Kate Baggaley|February 11, 2021|Popular-Science
Once again, the PATH system had the highest average particle concentration, at 1,020 micrograms per cubic meter.
Air pollution in US subway stations is disturbingly high|Kate Baggaley|February 11, 2021|Popular-Science
Given that the dirtiest and cleanest neighborhoods in New York City have an annual difference of about 4 micrograms per cubic meter, areas near heavy industries net a lot more deadly infections.
At New York City’s biggest power plant, a switch to clean energy will help a neighborhood breathe easier|Andrew Blum|February 2, 2021|Popular-Science

The United States’ standard is below that of the World Health Organization, which recommends a limit of 10 micrograms per cubic meter as an annual average.
Cracking down on soot pollution could save thousands of lives—but the EPA won’t do it|Ula Chrobak|December 10, 2020|Popular-Science
It was balanced to a microgram—to a millionth of the combined weight of three aspirin tablets.
Space Platform|Murray Leinster

microgram

[ mī′krə-grăm′ ]

A unit of weight equal to one-millionth (10-6) of a gram.