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The World Health Organization (WHO) says average annual levels of PM2.5 should not exceed 5 micrograms per cubic meter.—Rhea Mogul, CNN, 11 Mar. 2025 Though the World Health Organization recommends that average annual concentrations of PM2.5 should not exceed 5 micrograms per cubic meter, only 17% of cities worldwide meet its air quality standard, the report said.—Peter Guo, NBC News, 11 Mar. 2025 The World Health Organization recommends 5 micrograms of pollutant per cubic meter.—Kerry Breen, CBS News, 11 Mar. 2025 Iron doses in supplements are typically 18-65 micrograms.—Jillian Kubala, Health, 17 Feb. 2025 See All Example Sentences for microgram
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