Human Journey

Surgical Masks–Not Just for the E.R.

Beijing at sunrise.

Particulate levels in Beijing broke records last weekend, when the Municipal Environmental Monitoring Center recorded levels of PM2.5 that Reuters said may have reached 900 micrograms per square meter–more than 30 times what the World Health Organisation considers a safe daily level.

About the Blog

Researchers, conservationists, and others share stories, insights and ideas about Our Changing Planet, Wildlife & Wild Spaces, and The Human Journey. More than 50,000 comments have been added to 10,000 posts. Explore the list alongside to dive deeper into some of the most popular categories of the National Geographic Society’s conversation platform Voices.

Opinions are those of the blogger and/or the blogger’s organization, and not necessarily those of the National Geographic Society. Posters of blogs and comments are required to observe National Geographic’s community rules and other terms of service.

Voices director: David Braun (

Social Media