One control point further back along the pathway is the point of entry to the target. The standard here is called an ‘exposure standard’ or, in some circumstances, a ‘primary protection standard’. By agreeing a Directive setting standards for the quality of drinking water (see Section 4.4), including the maximum concentration of lead permitted, the Community has sought to ensure that the amount of lead swallowed with water is limited. Water supply can be tested and the water treatment or supply system adjusted to ensure that the standard is met. A standard where the exposure is by breathing is set in a Directive on air quality standards for lead (see Section 6.6). Yet another Directive limits the quantity of lead, among other substances, in animal feedingstuffs (Directive 74/63 OJ L38 11.2.74).