The game's timeframe takes place from sometime in August 1999 to 8 September 1999. This can be figured out from the date/time info on the in-game PDA equipment
The first levels involve a terror attack in the DC subway system. On the walls in the DC subway is an accurate reproduction of a DC Metro map.
This game Syphon Filter is included in the North American Playstation Classic Mini Console bundled with 20 games.