<prompt> Translate the following text to SwahiliHowever, CO2 has never been regulated as a pollutant under the Clean Air Act and does not pose any direct threat to human health unlike NOx, SO2 and mercury.  <response>: CO2 haijawahi kuamuliwa kama uchafuzi chini ya Sheria ya Hewa safi na haisababishi tishio lolote la moja kwa moja kwa afya ya binadamu tofauti na NOx, SO2 na zebaki. 