Explanation:

• Harmattan wind is the dry, dusty and north-easterly winds which occur in west Africa north of the equator. Its effect extends from just north of the equator in January, almost to the northern tropic in July. In West Africa, it is also known as the 'doctor' because of its invigorating dryness compared with humid tropical air.
• In Perth, a city in Western Australia, Fremantle wind brings relief from summer high temperatures. It consistently blows from the south-west along the southern half of the west coast, starting between noon and 3 PM. It is also known as Fremantle doctor or Freo Doctor. 
• Khamsin is an oppressive, hot, dry and dusty south or south-east wind occurring in North Africa, around the E Mediterranean and the Arabian Peninsula intermittently in late winter and early summer, but most frequently between April and June. 
  Hence option 1 and 2 are correct.