S pneumoniae is a gram-positive, catalase-negative coccus that has remained an extremely important human bacterial pathogen since its initial recognition in the late 1800s. The term pneumococcus gained widespread use by the late 1880s, when it was recognized as the most common cause of bacterial lobar pneumonia.
Only if the air it is circulating has carbon monoxide. Air conditioners do not produce nor do they contain carbon monoxide. If you suspect carbon monoxide in your air, you need to have an HVAC professional or your local gas company inspect your dwelling because another source is producing this deadly gas. Unmaintenanced heating systems are often the culprit.
Air conditioners do cause some harm for the environment, mainly through energy use and CFCs. If not properly maintained can cause have some negative health effects as well. Air conditioners use energy, and energy comes from power plants. Power plants are known for the pollutants that the release into the air (mercury and CO2 among them.) Air conditioners also contain CFC's and HCFCs (the cooling agents inside your AC.) These cooling agents are what's punching holes in our ozone layer.