After the overthrow of Tolbert, Johnson-Sirleaf went into exile in Nairobi, Kenya, where she worked for Citibank.
PM rādītājs — 2,5 vai 10 — attiecas uz daļiņas lielumu, ko nosaka, laižot gaisu caur filtru ar attiecīgi 2,5µm vai 10µm lielu diametru.