AN AIR AMBULANCE PLT COMPLETED A VFR APCH TO A RPTED ONE QUARTER MI VISIBILITY. RPTR CLAIMS THAT ACTUAL VISIBILITY WAS GREATER THAN 3 MI.

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ON AN AIR AMBULANCE FLT TO ZZZ; WHILE IN CONTACT WITH CTR; I ATTEMPTED TO LISTEN TO ZZZ ATIS. NO CONDITIONS WERE BEING XMITTED. UPON HDOF FROM CTR TO APCH; I WAS ASKED IF I HAD THE ATIS. I RESPONDED 'NEGATIVE ATIS.' THE CTLR RESPONDED THAT ZZZ WAS RPTING 1/4 MI IN FOG. I WAS 35-40 MI FROM ZZZ AT THE TIME AND HAD ZZZ VASI TO RWY X IN SIGHT; AND COULD SEE NO FOG. I CALLED COMPANY MEDICAL DISPATCH (LOCATED AT ZZZ) ON #2 COM; ASKED THEM TO 'LOOK OUT THE WINDOW' TO SEE IF THERE WAS FOG. THEY RPTED 'A LITTLE FOG; BUT VISIBILITY OK.' I THEN CALLED ZZZ TWR AND ASKED WHAT THEY WERE SEEING. THE CTLR SAID THAT FSS WAS CALLING IT 1/4 MI; BUT HE SAID HE COULD SEE RWY AND TXWY LIGHTS; LIGHTS DOWNTOWN; ETC. I THEN ASKED APCH TO RTE ME OVER ZZZ SO I COULD LOOK FOR MYSELF; WHICH THEY DID. I RPTED THAT I COULD SEE NO FOG ANYWHERE IN THE AREA. APCH SAID THEY COULD NOT DSND ME BELOW 2500 FT ON AN IFR FLT PLAN AND ASKED IF I WANTED TO CANCEL IFR. I STATED THAT I WASN'T OBSERVING ANY FOG AND WAS IN VFR CONDITIONS. I SAID YES. APCH HANDED ME OFF TO ZZZ TWR; AND AFTER CHKING ON; THE CTLR AGAIN SAID FSS WAS RPTING 1/4 MI. I TOLD HIM I WAS SEEING ABSOLUTELY NO FOG ANYWHERE AND WOULD CONTINUE FOR THE RWY. IT WAS A COMPLETELY NORMAL APCH TO LNDG. ALTHOUGH I DID ENCOUNTER SOME LIGHT FOG IN THE FLARE; I NEVER LOST SIGHT OF THE RWY EDGE LIGHTS OR REIL'S AT ANY TIME. AFTER SHUTTING DOWN AND UNLOADING THE PATIENT INTO THE GND AMBULANCE; I ASKED THE MEDICAL TEAM TO LOOK AT THE CONDITIONS ON THE FIELD. THEY STATED THEY COULD CLRLY SEE RWY AND TXWY LIGHTS; LIGHTS FROM THE FBO ON THE OTHER SIDE OF THE FIELD; LIGHTS ON ZZZ TWR AND STREET LIGHTS ON STREETS ADJACENT TO THE FIELD. IN RETROSPECT; EVEN THOUGH I COULD CLRLY SEE ALL RELEVANT RWY LIGHTS; WITH FSS RPTING 1/4 MI; I SHOULD HAVE DIVERTED. I WAS FEELING SOME PRESSURE TO COMPLETE THE TRANSPORT AS PLANNED SINCE THE PATIENT WAS ON A VENTILATOR. BY DIVERTING AND WAITING FOR THE GND AMBULANCE; THE VENTILATOR WOULD HAVE TO RUN ON BATTERY PWR FOR 15-20 MINS. I FELT THE EXTRA TIME COULD JEOPARDIZE PATIENT SAFETY. AT NO TIME DID I FEEL I JEOPARDIZED PATIENT OR CREW SAFETY BY LNDG AT ZZZ.