RedOrbit: Chinese government officials warned that residents of Beijing should remain indoors on Sunday as the citys notoriously poor quality air reached levels that far exceeded those deemed safe by health experts.
According to Louise Watt of the Associated Press (AP), the website of the Beijing Municipal Environmental Monitoring Center reported that the density of particulate matter less than 2.5 micrometers in size (PM2.5 particulates) had topped the 700 microgram per cubic meter level in several parts...