<prompt> Translate the following text to EnglishMifumo ya nafasi na msimu na mabadiliko ya muda mrefu ya muundo wa ukungu katika Marekani Uchambuzi wa data kutoka kwa Mtandao wa IMPROVE.  <response>: Spatial and Seasonal Patterns and Long Term Variability of the Composition of the Haze in the United An Analysis of Data from the IMPROVE Network. 