If you were to look at the animated GIF above you would be looking at the carbon monoxide levels during the month of July from 2002 to 2019. If you were to refer to the legend above you would be able to tell that the lighter the color the lower the risk of carbon monoxide poisoning. Also, If you were to look in the bottom right corner of the animated GIF you would be able to tell that there is little to no Carbon Monoxide in the air. So, where there black there is no carbon monoxide and where there are lighter colors there is less carbon monoxide and where there are darker colors there is more Carbon Monoxide.