Concerns about the effect of Beijing's notorious pollution took on a new aspect this week as the problems likely to be caused by air quality problems become apparent.
The smog is so thick over the training ground that medal contenders in the javelin event, while getting in some practice at their sport have complained of having thrown their javelins only to have them dissapear in the smog and never be seen again.
We fear the same fate may befall most of Britain's medal hopes.
Which Olympic events will you be watching?
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