Unlike some other air emission inventories, greenhouse gas inventories include not only emissions from source categories, but also removals by carbon sinks.

A source category is a specific industry sector or group of similar emitting sources.

She raised a combination of fingers, separating into source categories the audio channels she was monitoring.

However, an additional 12 source categories will begin reporting their 2011 GHG data this year.

An NSPS has been established for a number of individual industrial or source categories.

For each listed source category, EPA indicates whether the sources are considered to be "major" sources or "area" sources.

A few of the listed source categories were removed for various reasons.

View the source categories that were not regulated.

Each source category that emits radionuclides in significant quantities must meet technology requirements to control them and is required to meet specific regulatory limits.

The level of uncertainty of the resulting estimates depends significantly on the source category and the pollutant.