Parts per million

Carbon Monoxide Poisoning

• The OSHA PEL for CO is 50 parts per million (ppm). OSHA standards prohibit worker exposure to more than 50 parts of CO gas per million parts of air averaged during an 8-hour time period. • The 8-hour PEL for CO in maritime operations is also 50 ppm. Maritime workers, however, must be removed from exposure if the CO

  Part, Carbon, Million, Carbon monoxide, Monoxide, Parts per million, Per million parts

Youth population trends and sustainable development

718 million in 2015 to 711 million in 2030 and 619 million in 2060. ... per cent in 2006, the youth population is projected to ... increase by 7 per cent over the next 15 years. In some parts of ...

  Part, Million

American Labor in the 20th Century

Jan 30, 2003 · years. In 1933, there were more than 12 million workers unemployed; and the unemployment rate averaged 24.9 percent. More recently, double-digit unemployment rates were recorded during parts of 1982 and 1983, but there was a fairly steady decline from 7.8 percent in mid-1992 to 4.1 percent at the end of 1999.31

  Part, Million

ASHRAE Technical FAQ

ASHRAE Technical FAQ ID 35 Question What is the allowable level of carbon dioxide in an occupied space? Long Answer CO 2 at very high concentrations (e.g. …

The Carbon Cycle and Atmospheric Carbon Dioxide

The Carbon Cycle and Atmospheric Carbon Dioxide 185 Executive Summary CO 2 concentration trends and budgets Before the Industrial Era, circa 1750, atmospheric carbon dioxide (CO 2) concentration was 280 ±10 ppm for several thousand years. It has risen continuously since then, reaching 367 ppm in 1999.