There's a strange smell outside my house? It could be some kind of gas.... It's form of sharp, and sort...

It could be some kind of gas....

It's form of sharp, and sort of like sharp and metallic too...it's really strange. It also gives me a headache, that's why I thought it might be some sort of fumes....any accepted wisdom?

There's a garbage can near used rabbit litter nearby, thought it might be methane or something, but next I remembered methane was odorless....so I'm not sure.
Furnace grill - why does the blower not...
Answers:    If it make your eyes water when strong, it is Ammonia.

Ammonia is created fluently from urine decaying and can be very strong.
Get a lid for the can (or complain to your neighbours).
Hewever, as this pet litter is a rich source of fertiliser - draw from it used for fertilising bushes and shrubs - just verbs it into the surface soil - Soil bacteria will soon convert it to a non-smelly text, and the plants will benefit. - Everybody happy !
Electric switch out of action?
It might be some electrical wires that are really hot. You might want to enjoy someone from the fire Dept come check on it If its gas, I wouldn't wait. In reality I'd call them presently. Hope its nothing serious.