Glossary and abbreviations

• Primary: a pollutant emitted directly by human activities or nature (sulfur dioxide, for example).
• Secondary: a pollutant produced by the chemical interaction of primary pollutants in the atmosphere (ozone, for example).

A PPP is a locally tailored contract through which the municipality assigns certain tasks to a private-sector company and sets performance targets. The municipality retains ownership of the asset and the controlling power, unlike privatization, which is based on the transfer of ownership of assets. Municipalities are increasingly turning to PPPs for the management of their water services.