The continents of africa and south america used to "fit together" like puzzle pieces. about how far back in time would you have to go to find africa and south america connected together?

The continental drift hypothesis suggested that all the continents had been a single supercontinent approximately 200 million years ago. This was called pangea. 

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”