What do you mean particulates...you need that stuff.
It depends on how extreme you want to go and how much you want to spend up front, and on servicing every 4 months. But to get rid of the sulfur smell you can get an "air raider box" this is basically used for radon mitigation in water systems. This will remove that sulfur smell, my cousins in Watkins Glenn NY have one we acquired and it works like a dream. You just have to clean it like I mentioned.
Go with what the company in your area recommends and services, it will be less expensive that way, with the same results.