The common contaminants to be measured in the metropolitan area are ozone and particulate matter (PM). Cars and trucks and other mobile sources are the major sources of ozone in the summertime. In the winter, wood smoke from wood stoves and fireplaces is a major source of PM pollution. Many countries monitor ground-level ozone, particulates, sulfur dioxide, carbon monoxide and nitrogen dioxide and calculate air quality indexes for these pollutants. 
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Glossary
Injection Molding Design Guide
Guide for high quality and cost-effective plastic injection molding.
Essentials of Manufacturing
Information, coverage of important developments and expert commentary in manufacturing.
Metal 3D Printing Design Guide
Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.
Selecting the Right 3D Printer
Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.