COMETS AND TAILS - SOURCE: ESA Situation Comet Dust Elevated Affecting Human Respiration "...The CODITA project was designed to answer two overarching questions: how much cosmic dust enters the Earth’s atmosphere every day, and what impact does the dust have throughout the atmosphere? ...Estimates of the rate of input of cosmic dust into the Earth’s atmosphere vary from about 3 to 300 tonnes per day, depending on how this is measured. ...the dust has several sources: Jupiter