A hot air balloon promoting a Cirque du Soleil production in Perth has been forced to make an emergency landing.

Police say the hot air balloon carrying two people landed in Burswood, in Perth's east, about 8.30am (WST) on Tuesday.

There were no injuries and it was not clear why the balloon had to make an emergency landing, police said.

It first went up last week and had been floating over the city to promote the production Ovo.