Around 25 firefighters were called to a property in Farnborough on Tuesday evening (June 17) after a man breathed in hazardous fumes from a fish tank.
Firefighters from Rushmoor, Basingstoke and Winchester were called to an address in Lynchford Lane just before 9.30pm, following reports that a man in his 40s had been feeling unwell.
Six fire engines from Rushmoor fire station attended and crews cordoned off the area for two hours.
A spokesperson said the man had been exposed to a flammable gas, which turned out not to pose a risk to neighbours.
One ambulance from South East Coast Ambulance Service (SECAmb) attended and the man was assessed and treated for breathing difficulties before being taken to Frimley Park Hospital.
A spokesperson for SECAmb said he had suffered the effects of breathing in chemical fumes, but was now thought to have made a full recovery.