<prompt> unaweza kugeuza matini haya ya swahilikwa kiingereza?jiji la mji mkuu hapo awali lilikuwa limejitangaza chini ya mazingira ya dharura ya mazingira kwa siku nne kama kiwango cha uchafuzi wa hewa mzuri pm2.5 kilinaswa.  <response>: the capital city had previously declared itself under environmental contingency for four days as levels of very fine air pollutants pm2.5 spiked. 