The BBC informs, low levels of radioactive iodine believed to be from the Fukushima nuclear plant in Japan have been detected in Glasgow and Oxfordshire.
Health protection officials said the concentration of iodine 131 detected in air samples was "minuscule" and there was "no public health risk in the UK".
The Fukushima plant was crippled after being hit by a tsunami in the aftermath of a huge earthquake on 11 March.
Radiation leaks were recorded following subsequent explosions and fires.
The Scottish Environment Protection Agency (Sepa) said it had been informed that an air sampler in Glasgow, almost 6,000 miles from Japan, had recorded the presence of radioactive iodine.
The agency said the value reported was consistent with reports from other European countries such as Iceland and Switzerland.
The organisation's radioactive substances manager, Dr James Gemmill, said: "The concentration of iodine detected is extremely low and is not of concern for the public or the environment.
"The fact that such a low concentration of this radionuclide was detected demonstrates how effective the surveillance programme for radioactive substances is in the UK.