BusyBodyHealth

Having asthma depletes glutathion, themaster antioxidant in the body.

To boost glutathione, use NAC 1 g in the mornings and 200 mcg selenium (or Brazil nuts) in the evening along with 3 mg of melatonine.

Hawthorn improves lung functions.

Can buy reduced glutathione powder and neubulize daily to restore lung glutathione levels.

Other powerful anti-inflammatory agents that improves the condition are: 

1. Vitamin C

2. Freshly squeezed lemon juice in water. 

3. Cayenne Peppers - Excellent

4. Omega-3 Fats - Should be an integral part of any diet. 

5. Ginger - Raw ginger has a high ORAC value of 14,840

6. Tumeric - Ground spice has high ORAC value of 127, 068; excellent in treating many ailments

7. Vitamin D3 - therapeutic levels in blood is 50-70 ng/ml

Reduce and eliminate sugars and gluten will help. Be aware of hidden sugars in names such as dextrose, maltose, sucrose, corn syrup, high frustose corn syrup, honey, etc. See 57 names of sugar here. 

Sources:
http://www.earthclinic.com/cures/asthma.html
http://www.earthclinic.com/children/asthma-remedies.html
http://oracvalues.com/
http://www.prevention.com/food/healthy-eating-tips/57-names-sugar