geodata.convert.convert_pm25
============================

.. py:function:: geodata.convert.convert_pm25(ds)

   Generate PM2.5 time series according to [1]:

           PM2.5 = [Dust2.5] + [SS2.5] + [BC] + 1.4*[OC] + 1.375*[SO4]

   :param \*\*params:
   :type \*\*params: None needed currently.

   .. rubric:: References

   [1] Buchard, V., da Silva, A. M., Randles, C. A., Colarco, P., Ferrare, R., Hair, J., … Winker, D. (2016).
       Evaluation of the surface PM2.5 in Version 1 of the NASA MERRA Aerosol Reanalysis
       over the United States. Atmospheric Environment, 125, 100-111.
   https://doi.org/10.1016/j.atmosenv.2015.11.004