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Samples in periodicals archive:
In global terms, the worst air quality is found in Pakistan, where the concentration of particulate matter with a diameter smaller than 10 microns reached 282 micrograms per cubic meter of air, followed by Afghanistan, Bahrain, Qatar and Bangladesh.
2 micrograms per cubic meter of air in China's most polluted city.
That is because the Occupational and Safety Administration wants to reduce its permissible exposure limit (PEL) for crystalline silica from 100 to 50 micrograms per cubic meter of air and add a new action level of only 25 micrograms.
3 micrograms per cubic meter of air, and took comments for the 0.
Those steps helped bring peak levels of small particulates down to 47 micrograms per cubic meter of air last year from more than 80 in 2002, according to LRAPA figures.
An EPA panel recently recommended that the particulate matter standard be lowered from 15 micrograms per cubic meter of air to 13 micrograms or 14 micrograms.
The revised standard, which will take effect in 2015, lowers the 24-hour exposure to PM from 65 micrograms per cubic meter of air to 35 micrograms.
The suit said that EPA scientists recommended lowering the acceptable level for airborne soot--particulate matter emitted from motor vehicle exhaust, factory and power plant emissions and wood fires--to 13 or 14 micrograms per cubic meter of air, down from the 15-microgram level now in affect.