Commission Decision of 29 April 2004 laying down a questionnaire to be used for annual reporting on ambient air quality assessment under Council Directives 96/62/EC and 1999/30/EC and under Directives 2000/69/EC and 2002/3/EC of the European Parliament and of the Council (notified under document number C(2004) 1714) (Text with EEA relevance) (2004/461/EC) (repealed)

Form 23 Exceedence of limit values of PM₁₀ due to natural events (1999/30/EC Article 5(4))

- Form 23a Contribution of natural events to exceedence of the PM₁₀ limit value (stage 1; 24hr mean)

- Form 23b Contribution of natural events to exceedence of the PM₁₀ limit value (stage 1; annual mean)

Note to Form 23:

The natural event can be indicated by one or several standard codes provided by this questionnaire (see Table 5).

Table 5 Natural events causing limit value exceedences for PM_10: standard codes

Natural event code	Description
A1	Volcanic eruption inside the Member State
A2	Volcanic eruption outside the Member State
B1	Seismic activity inside the Member State
B2	Seismic activity outside the Member State
C1	Geothermal activity inside the Member State
C2	Geothermal activity outside the Member State
D1	Wild-land fire inside the Member State
D2	Wild-land fire outside the Member State
E1	High wind event inside the Member State
E2	High wind event outside the Member State
F1	Atmospheric resuspension inside the Member State
F2	Atmospheric resuspension outside the Member State
G1	Transport of natural particles from dry regions inside the Member State
G2	Transport of natural particles from dry regions outside the Member State