Yes, weather conditions can contribute to smog. For instance, warm temperatures of 20 degrees C and higher, slow wind speeds, and still, stagnant air can all contribute to smog.
Definitely. Usually, temperatures in the troposphere (the layer of our atmosphere that we breathe) decrease with increasing distance from the earth. Since warm air tends to expand and rise, this temperature profile gives the troposphere a certain amount of turbulence that distributes pollutants far from their sources. However, sometimes we experience an inversion, which traps smog and other pollutants close to the surface of the earth where we breathe. Here are a few links with pictures so that you can see how an inversion works.
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