¹ The cantons shall enforce this Ordinance unless it delegates enforcement to the Confederation.

² If the federal authorities apply other federal laws or international treaties or decisions that relate to the subject matter of this Ordinance, they shall also enforce this Ordinance. The cooperation of the Federal Office for the Environment and the cantons is governed by Article 41 paragraphs 2 and 4 of the Act; statutory duties of secrecy are reserved.

³ The following authorities are responsible for enforcing the provisions governing emission limitation measures (Art. 4, 7–9 and 12), improvements (Art. 13, 14, 16–18 and 20) and the determination and control of noise exposure levels (Art. 36, 37, 37a and 40):

a.

for railway installations:

1.

DETEC, where the provisions relate to major railway projects under the Annex to the Railways Act of 20 December 1957⁴⁴ and are implemented by means of a planning approval procedure,

2.

in other cases, the Federal Office of Transport;

b.

for civil aerodromes:

1.

DETEC, where the provisions relate to buildings and installations under Article 37 of the Air Navigation Act of 21 December 1948⁴⁵ that are used for operation of an aerodrome and are implemented by means of a planning approval procedure,

2.

in other cases, the Federal Office of Civil Aviation;

c.

for national roads:

1.

DETEC, where the provisions are implemented by means of a planning approval procedure,

2.

in other cases the Federal Roads Office;

d.

for national defence installations: the Federal Department of Defence, Civil Protection and Sport;

e.

for electrical installations:

1.

the Swiss Federal Office of Energy in cases where the Federal Inspectorate for Heavy Current Installations (ESTI) has been unable to deal with objections from or resolve disputes with the Federal authorities concerned, in accordance with Article 16 paragraph 2 letter b of the Electricity Act of 24 June 1902⁴⁶,

2.

in other cases the ESTI;

f.

for cable railway installations according to Article 2 of the Cable Railways Act of 23 June 2006⁴⁷: the Federal Office of Transport⁴⁸.

⁴ In cases where the responsibility for ordering emission limitation measures and improvements lies with the federal authorities, but that for noise protection lies with the cantonal authorities, the two authorities shall coordinate the necessary measures.

⁵ For national roads, DETEC is also responsible for enforcing the provisions governing soundproofing measures (Art. 10 and 15). It coordinates the enforcement of these provisions with the soundproofing measures that are arranged by the cantons.⁴⁹