Amends the Illinois Radon Awareness Act. Defines "dwelling unit", "lease", "lessor", "mobile home", "radon", "radon contractor", and "tenant". Repeals a provision regarding the disclosure of radon hazard to current and prospective tenants. Provides instead that at the time of a prospective tenant's application to lease a dwelling unit, before a lease is entered into, or at any time during the leasing period upon request, the lessor shall provide the prospective tenant or tenant of a dwelling unit with the Illinois Emergency Management Agency's "Radon Guide for Tenants" pamphlet, copies of any records or reports pertaining to radon concentrations within the dwelling unit that indicate a radon hazard to the tenant, and the Disclosure of Information on Radon Hazards to Tenants form. Provides that at the commencement of the agreed leasing period, a tenant shall have 90 days to conduct his or her own radon test of the dwelling unit. Creates the Disclosure of Information on Radon Hazards to Tenants form. Requires a lessor or tenant who decides to have radon mitigation performed to have the radon mitigation system installed by a radon contractor. Requires a tenant who decides to have radon mitigation performed to have the express consent of the lessor prior to undertaking any mitigation activities. Provides that the new provisions apply to leases entered on and after the effective date of the amendatory Act. Includes home rule provisions. Makes other changes.