How did the emergency vehicles get there so quickly?

In the very first episode of Breaking Bad (S1E1 Pilot), Walt and Jesse drive the RV out into the middle of nowhere, New Mexico. They are many miles from civilization. The closest sign of human life is a small farm two miles away.
During the events of the episode, there are gunshots and a brush fire near the RV. Soon after, we hear sirens in the distance (this is actually where the episode begins, three weeks later).
This was a remote location and there was a very short time between smoke and gunshots being discernible and the sirens being heard. How did emergency vehicles show up so quickly?
Even if someone at the distant farm saw smoke and called 911, how could anyone respond so quickly? Was this some kind of setup by the bad guys in the episode?
Best Answer
The emergency vehicles were not there to attend to reports of gunshots. They were there for the fire (much to Walter's relief).
I suspect that the reason they responded and did so quickly was that there was some sort of watch for smoke in a district prone to fire. It is likely that, in a parched, flat area where fires tend to break out, there is a standing watch for smoke. And, since the area is flat, the smoke is easy to spot.
Maybe they were still fast but they clearly were unconcerned with Walter so were not either set up by the drug dealers or in search of other suspicions characters. This leaves us with them having spotted the smoke.
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