Narrative:

While descending on the arrival; we received an ice indication. So; we elected to turn the APU and anti-ice on. On switching the bleeds; I; as the first officer (first officer); noticed a faint smell that I could not identify from the packs. But shortly after; the odor cleared and I could not smell it again and believed it to be just the packs switching to the APU. Later on; around 8;000; the flight attendant notified us that there was a fuel smell in the very back of the cabin and it was persisting. The captain communicated the issue and we both concluded that there was no smell in the cockpit. We continued the approach and not even a thousand feet or so later; I had a feeling in my stomach that [that] was not normal. I immediately notified the captain and we decided to put our oxygen masks on and requested priority handling.we continued the approach and I landed the aircraft at ZZZ. On exiting the runway at the hold pad of xx; we ran the QRH and decided [that] we needed to evacuate the aircraft. After running the evacuation checklist; the captain notified all [of] the contacts and everyone was bused in. The plane was [then] towed to the gate. The fire crew notified us of no detection on the equipment but they noticed a petroleum smell in the back of the cabin.the flight attendant notified us of the smell that she and [the] passengers noticed; as well as the crew in the cockpit noticing something on APU start up and my stomach getting upset on approach. [The cause was a] smell of fuel or some other unknown thing in the cabin. Dawned and 100 percent on the oxygen masks for me and the captain; notifying ATC and landing the plane in ZZZ. [Suggest] a further inspection of the packs or the plane for issues.

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Original NASA ASRS Text

Title: CRJ-200 First Officer reported a fumes event during arrival noticed by passengers; Flight Attendant; and flight crew.

Narrative: While descending on the arrival; we received an ice indication. So; we elected to turn the APU and anti-ice on. On switching the bleeds; I; as the FO (First Officer); noticed a faint smell that I could not identify from the packs. But shortly after; the odor cleared and I could not smell it again and believed it to be just the packs switching to the APU. Later on; around 8;000; the Flight Attendant notified us that there was a fuel smell in the very back of the cabin and it was persisting. The Captain communicated the issue and we both concluded that there was no smell in the cockpit. We continued the approach and not even a thousand feet or so later; I had a feeling in my stomach that [that] was not normal. I immediately notified the Captain and we decided to put our oxygen masks on and requested priority handling.We continued the approach and I landed the aircraft at ZZZ. On exiting the runway at the hold pad of XX; we ran the QRH and decided [that] we needed to evacuate the aircraft. After running the evacuation checklist; the Captain notified all [of] the contacts and everyone was bused in. The plane was [then] towed to the gate. The fire crew notified us of no detection on the equipment but they noticed a petroleum smell in the back of the cabin.The Flight Attendant notified us of the smell that she and [the] passengers noticed; as well as the crew in the cockpit noticing something on APU start up and my stomach getting upset on approach. [The cause was a] smell of fuel or some other unknown thing in the cabin. Dawned and 100 percent on the oxygen masks for me and the Captain; notifying ATC and landing the plane in ZZZ. [Suggest] a further inspection of the packs or the plane for issues.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.