Clegg moved to allay fears over the quality of the air in Beijing.
"This week has not been particularly good but last Thursday, Friday and Saturday there were absolutely blue skies," added Clegg.
"We continue to have every confidence that it will be fine for the duration of the Games."
GB athletes are starting to arrive at the holding camp in Macau before moving on to Beijing, and Team GB performance director Bernie Cotton is confident this will aid their preparation.
Beijing's air pollution has not improved.
"There is a unique combination of excellent facilities and good accommodation with everything really close together," Cotton told BBC Radio 5 Live.
"The Olympic Village can become full of distractions and boring for some athletes. The training facilities are very crowded."
Cotton estimates that the holding camp, which runs for five weeks, will cost in the region of £1m, but is confident it represents good value for money.
"There is a real value," he added. "A value in performance terms, in allowing the athletes to get ready in peace and calm and with the best facilities possible. But then there is also a team ethos that builds here."
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