3 ms·
To answer one of your questions, the US EPA's standard is 12 ug/m^3 averaged annually, and at most 35 in any 24-hour period[1]; the EU's is 25 annually.[2] [1]
by comex 12y ago
To answer one of your questions, the US EPA's standard is 12 ug/m^3 averaged annually, and at most 35 in any 24-hour period[1]; the EU's is 25 annually.[2]
[1] http://www.epa.gov/pm/2012/decfsimp.pdf http://www.epa.gov/pm/2012/decfsimp.pdf
[2] http://ec.europa.eu/environment/air/quality/standards.htm http://ec.europa.eu/environment/air/quality/standards.htm
- mikeash 12y agoThe US embassy in Beijing runs their own particulate pollution monitor, as the Chinese government's are somewhat suspect. A few years ago, the level became so high that it ran off the end of the scale. The programmer had put in a descriptor of "Crazy Bad" for that level as a joke, and that ended up being posted to the official Twitter feed. http://blogs.wsj.com/chinarealtime/2010/11/25/shanghai%E2%80%99s-air-bad-but-crazy-bad/ http://blogs.wsj.com/chinarealtime/2010/11/25/shanghai%E2%80...