★★★★★
Yes, I would agree that climate (and also smog) can affect sinus issues. I had nonstop sinus issues and allergies starting about a year after I moved to Southern California. After years of suffering from this, we moved to the humid South and I haven't had a sinus infection or serious allergy attack since then. Half of my friends who live in dry and polluted environments have terrible sinus issues.
Humidify
★★★★★
First of all, moisture in the air is very important. Many people get sinus infections during the winter months being cooped up in the house. I prefer the Vick's Vaporizer in my bedroom and I try to keep it boiling @ night. Servicing your heater filters regularly is important too, filters should be changed @ month. At the first sign of a sinus infection I snort a sea salt, baking soda, distilled water solution up my nose 2x's a day, That really helps. 1cup distilled water 1tsp. sea salt, 1/4 tsp soda, slightly heat in microwave, put in a baby bulb and snort it up your nose. I know it sounds gross and it is but it WORKS!