                       **Study population**                                **Follow-up period**   **Pollutant**   **Conc**^**a**^**(μg/m**^**0**^**)**   **Spatial scale**^**b**^   **% change in risk (00%CI) in mortality per 00 μg/m**^**0**^   **References**      ------------------------------------ --------------------------------------------------- ---------------------- --------------- -------------------------------------- -------------------------- -------------------------------------------------------------- ---------------- ------------   