I can tell you from personal experience that these remedies really help. Try adding them to your diet and daily routine.

• Extra Virgin Coconut Oil
  It’s a natural antibiotic / antifungal / antimicrobial agent that stimulates your immune system, is great for your liver, speeds up your metabolism, and does wonders for your skin. Cook with it, spread it on like butter, or use it topically on skin.
• Raw, Unfiltered Local Honey
  The pollen in the unfiltered local honey helps your body build up an immunity to what is in your air.
• The Neti-pot
  Be not afraid of the Neti-pot. Salt-water + gravity + your nasal passage = the ability to breathe.

And for anyone with an infection, ingest the following natural anti/pro-biotics (they deal with the bad bacteria without killing all the good):

• Extra Virgin Coconut Oil
• Onions
• Garlic
• Probiotics (as a supplement or better yet, a fermented food)

A special note to those with asthma:
Look at what cleaners you use or any fragrance you constantly encounter. Cleaners like Clorox and Tilex, etc. are known lung irritants, and anything that lists “fragrance” as an ingredient should be off-limits, even perfumes. (Companies are not legally required to list the potential hundreds or thousands of ingredients in their “fragrances.”) Instead, try using essential oils to make your home and body smell good. I make my own perfume using jojoba oil, orange oil, and frankincense.