My apartment is being fumigated because some other tenants had bed bugs. i don't have them and don't want my apartment sprayed w

Not likely, because the landlord can be ordered to perform this type of remediation. It is not reasonable to refuse. Usually when tenants contact lawyers with issues regarding treating infestations it is because the landlord won't do it--not because the tenant doesn't want it. I know of cases where tenants have vehemently refused this type of fumigation. It resulted in their apartment being overrun with displaced bedbugs that escaped the rest of the building. So do this at your own risk.

You should provide access to the landlord to treat your apartment for bedbugs. Bedbugs can travel from apartment to apartment, so the most effective treatment is often to treat several adjoining apartments or even an entire building. Failure to provide access for treatment is very likely a violation of your lease. If you fail to voluntarily provide access the landlord could possibly use that as grounds to terminate your tenancy and proceed to court to try to evict you.

No, the landlord is obligated to address bed bugs and to so properly he needs to treat the entire bldg. plus their most likely language in your lease Lease that would address this.