<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.american lung association makadirio ya kwamba watu wengi kutumia 90 ya muda wao ndani ya nyumba, hivyo safi hewa ya ndani ni muhimu sana.  <response>: the american lung association estimates that most people spend 90 of their time indoors, so clean indoor air is very important. 