If you're trying to avoid wrinkles just know that 68 nanograms of Botox is lethal.

如果你想避免皱纹的出现，只要知道68毫微克的肉毒杆菌是致命的。

The concentrations of 70 micrograms per liter.

浓度为每升70微克。

The levels of gold and silver were very small, in the micrograms, or even nanograms, but when you add them up it's pretty substantial.

“虽然金银的数量很少，微克甚至毫微克，但是它们加起来后的数量相当可观。”

The average measurement in Chad was 89.7.

乍得的PM2.5平均测量值为89。7微克/立方米。

Using Anroop Nair's human equivalent dose conversion, we can estimate that a 70 kg human would need a dose of 0.0013 milligrams or 1.3 micrograms per kilogram of NDMA.

使用 Anroop Nair 的人体当量剂量换算，我们可以，个七十公斤重的人需要摄入 0.0013 毫克或 1.3 微克每公斤 NDMA 的剂量。

In India, New Delhi's measurement of 92.7 micrograms made it the most-polluted capital city.

印度，新德里的PM2.5浓度是92.7微克/立方米，这使其成为污染最严重的首都城市。

The city's average concentration of PM2.5 was 28 micrograms per cubic meter during the period.

间，北京PM2.5的平均浓度为每立方米28微克。

The city's average concentration of PM2.5 was 33 micrograms per cubic meter in 2021, the lowest level since record-keeping began in 2013, Yu Jianhua, deputy director of the Beijing municipal ecology and environment bureau, said at a press briefing.

北京市生态环境局副局长余建华新闻发布会上表示，2021 年，北京市 PM2.5 的平均浓度为 33 微克/立方米，是自 2013 年开始记录以来的最低水平。

Jonathan M. Samet, a pulmonary disease specialist who is dean of the Colorado School of Public Health, said the most recent studies showed negative health effects well below the 12-microgram standard.

乔纳森·萨梅特是科罗拉多公共卫生学院院长兼肺病专家，他说，最近的多项研究表明，微粒水平远低于12微克这标准的空气依然会给人体健康带来负面影响。

Polonium is a highly toxic substance and just one microgram -- about the size of a speck of dust -- is enough to kill a person.

钋是种剧毒物质，仅仅微克，也就点灰尘大小的钋便可致人死亡。

The average concentration of the pollutants in the city fell by 9.5 percent year on year to 38 micrograms per cubic meter, the lowest since 2013.

全市污染物平均浓度同比下降9.5%，降至每立方米38微克，为2013年以来最低。

The World Health Organization (WHO) has said cities should have a maximum measurement of just 5 micrograms of PM2.5 per cubic meter.

世界卫生组织表示，城市PM2.5的最高测量值应控制5微克/立方米。

The average concentration of PM2.5 in Beijing is 33 micrograms per cubic meter in the first 11 months of this year.

今年前 11 个月，北京的 PM2.5 平均浓度为每立方米 33 微克。

World Health Organization (WHO) guidelines recommend concentrations stay below an average of 15 micrograms per cubic metre over 24 hours.

世界卫生组织（WHO）的指导方针建议 24 小时内将浓度保持平均每立方米 15 微克以下。

The city's average concentration of PM2.5 stood at 33 micrograms per cubic meter in the January to May period.

1 月至 5 月间，北京的 PM2.5 平均浓度为每立方米 33 微克。

For comparison, the annual U.S. budget would be enough to create only a few micrograms of antimatter.

相比之下，美国每年的预算足以制造出几微克的反物质。

U.S. Surgeon General Vivek Murthy is calling for a nationwide effort to fight misinformation about COVID-19 and vaccines.

美国卫生局局长维微克·穆尔西(Vivek Murthy)呼吁全国打击有关新冠疫情和疫苗的虚假信息。

124 micrograms is all it takes to kill you, about the same weight as two human eyelashes.

仅 124 微克就可以致人死亡，也就相当于人类两根睫毛的重量。

This week, a high of more than 1,000 micrograms was recorded in one part of South Korea.

本周韩国的个地区创下了超过1000微克的记录。

That compared with a 3 percent increased risk for every 3 microgram increase in non-wildfire particles.

相比之下，以非野火烟雾释放方式，颗粒物每增加3微克，被诊断患有痴呆症的风险就会增加3%。