Stationary sources. These can be subdivided into:

Rural area sources such as agricultural production, mining and quarrying.

Industrial point and area sources such as manufacturing of chemicals, non-metallic mineral products, basic metal industries, power generation.

Community sources, e.g. heating of homes and buildings, municipal waste and sewage sludge incinerators, fireplaces, cooking facilities, laundry services and cleaning plants.

Mobile sources. These comprise any form of combustion-engine vehicles, e.g. light duty gasoline-powered cars, light and heavy-duty diesel-powered vehicles, motorcycles, aircraft, and including line sources such as fugitive dusts from vehicle traffic.