Air Elementals appear on the material plane as swirling tornado's with glowing grey eyes and a rush of noise. They tend to take on colouration from the surrounding air particles ( Watery Blue near the Sea, a Sickly Yellow near certain pollutants) and are sometimes summoned to test for purity of air, though normally as a last resort.
You need to learn the Planar Summons (Air Elemental) Spell
Prerequisites
And
Or
You also need $500 of Magically/Alchemically Enhanced Insenses and Oils associated with Purity of Air.
You also should use a Magic Circle or Medicine Lodge to ensure you don't get outside influences disrupting your summoning
Lesser Air Elemental
This is a basic Air Elemental with minimal Attributes, Total 50 points (Cost 5)
Attributes: ST 6 [-40], DX 11 [+20], IQ 8 [-40], HT 8 [-20]
Secondary Characteristics: SM -1, Hit Points +2 [+4], Speed 4, Move 4, Dodge 7
Advantages: Flight (Lighter than Air, -10%) [+35], Immunity to Metabolic Hazards [+30], Injury Tolerance (Diffuse) [+100], Inate Attack (Suffocation):{Melee (Close), Side-Effect (Stun), Area Effect (2yd), Contact Agent} L1(1d6) [+26/Level]. Inate Attack (Toxic Breath): {Jet, Respitory Agent, Resisted ( HT -2)} L1(1d6) [+5/Level]
Disadvantages: Vulnerability (Earth Based Attacks; x2) [-20], Fragile (Unnatural) [-50]
Larger Air Elemental
This is a more powerful, and more costly Air Elemental, Total 80 points (Cost 8)
Attributes: ST 8 [-20], DX 11 [+20], IQ 8 [-40], HT 8 [-20]
Secondary Characteristics: Hit Points +4 [+8], Speed 4.75, Move 4, Dodge 7
Advantages: Flight (Lighter than Air, -10%) [+35], Immunity to Metabolic Hazards [+30], Injury Tolerance (Diffuse) [+100], Inate Attack (Suffocation):{Melee (Close), Side-Effect (Stun), Area Effect (2yd), Contact Agent} L2(2d6) [+52(+26/Level)]. Inate Attack (Toxic Breath): {Jet, Respitory Agent, Resisted ( HT -2)} L3(3d6) [+15(+5/Level)]
Disadvantages: Vulnerability (Earth Based Attacks; x2) [-20], Fragile (Unnatural) [-50]
The above 2 are just examples, the costs can be tweaked within reason. Attributes have no limits except for Power Levels, same with the two innate attacks, adding HP, Speed, Move and Enhanced Dodge are viable within limits.
The Suffocation Innate Attack is resolved as an Area Attack at Close Melee Range, the air elemental swirls around the victim cutting off their supply of Oxygen and battering their body to make it hard for them to remove themselves from the area. It also buffets and damages people in the surrounding hexes but doesn't Stun them.