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

如果你想避免皱纹出现，只要知道68毫微毒杆菌是致命。

The concentrations of 70 micrograms per liter.

浓度为每升70微。

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.

“虽然金银数量很少，微甚至毫微，但是它们加起来后数量相当可观。”

The average measurement in Chad was 89.7.

乍得PM2.5平均测量值为89。7微/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 人体当量剂量换算，我们可以估计，一个七十公斤重人需要摄入 0.0013 毫或 1.3 微每公斤 NDMA 剂量。

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

在印度，新德里PM2.5浓度是92.7微/立方米，这使其成为污染最严重首都城市。

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

在此期间，北京PM2.5平均浓度为每立方米28微。

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在新闻发布会上表示，2021 年，北京市 PM2.5 平均浓度为 33 微/立方米，是自 2013 年开始记录以来最低水平。

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长兼肺病专家，他说，最近多项研究表明，微粒水平远低于12微这一标准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.

钋是一种剧毒物质，仅仅一微，也就一点灰尘大小钋便可致人死亡。

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，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最高测量值应控制在5微/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 PM2.5 平均浓度为每立方米 33 微。

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）指导方针建议在 24 小时内将浓度保持在平均每立方米 15 微以下。

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

在 1 月至 5 月期间，北京 PM2.5 平均浓度为每立方米 33 微。

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

相比之下，美国每年预算足以制造出几微反物质。

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·穆尔西(Vivek Murthy)呼吁在全国打击有关新冠疫情和疫苗虚假信息。

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

仅 124 微就可以致人死亡，也就相当于人类两根睫毛重量。

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

本周韩国一个地区创下了超过1000微记录。

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，被诊断患有痴呆症风险就会增加3%。