The radon concentration in the average UK home is about 20 becquerels per cubic metre.
Action to deal with the problem is recommended when the concentration reaches 200 becquerels per cubic metre.
The limit, set by the European Union, is 40 micrograms of NO2 per cubic metre of air.
Anchor Hill was found to have a reading of 47.7 micrograms per cubic metre, with the government's objective level being 40 micrograms.
BBC: Air pollutants in Woking above government target levels
On April 21st the CAA established a new rule, deeming regions thought to have less than 2, 000 micrograms of dust per cubic metre safe for flight.
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They were part of a group of 15 locations that failed to meet the EU and UK standard of 40 micrograms per cubic metre of nitrogen dioxide.
In Beijing, water rates for home use start at just one yuan (about 12 cents) per cubic metre, far below cost, with heavy users paying a bit more.
However, a recent review of evidence carried out by WHO found there were now concerns about a health impact at levels much lower than 10 microgrammes per cubic metre.
Xinhua says that readings in Beijing for the tiniest pollution particles - called PM2.5 - reached more than 400 microgrammes per cubic metre on Thursday, which is considered "dangerous".
Its guidelines say average concentrations of the tiniest pollution particles - called PM2.5 - should be no more than 10 microgrammes per cubic metre but UK standards allow up to 25.
Levels found by the Health Protection Agency in the vicinity of the Plevins plant were recorded at 8.2 microgrammes per cubic metre while levels outside Armstrongs were 8.8 - both well within the acceptable levels.
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