Answer given by Mr Potočnik on behalf of the Commission
The Commission is aware of the claims concerning ‘chemtrails’ and has responded on several occasions to similar claims from the public or the institutions (e.g. E‑002455/07 by M Meijer and E‑006621/11 by Ms Childers)(1). However, it has found no evidence for the claims made on the adverse effects on human health.
The Commission is aware of several research programmes(2) where small amounts of non-damaging tracer substances are released to validate dispersion models used for civil protection (e.g accidental chemicals or radioactivity releases) or meteorological forecasts. There is no evidence that these small releases have any adverse effect on human health.
The Commission has no knowledge of any deliberate releases of toxic substances, such as heavy metals or pathogenic substances from the ground, aircraft or otherwise that would be damaging human health.
The ETEX project validated air pollution dispersion models (Atmospheric Environment Vol. 32, No 24, pp. 4245–4264, 1998) and the ATMES project validated models for accidental radioactive releases (see