How can I improve these?

There's a storm/sandstorm that rolled in yesterday here at our location and I manage to take a few shots before it was on top of us. The pics came out as what we are looking at..lighting conditions, colors, etc. I like what I see but I think it's TOO GRAINY. Any suggestions? All were taken in manual mode and at base ISO 100 with my LX7 (I wish I had my O-MD at the time). I have been using ADSee Pro 4 for minor PP. Will Lightroom be any better.

Thanks for looking and CC's are always welcome and greatly appreciated.