; and (ii) smoke dispersion and transport; and (B) the associated environmental impacts occurring during and after fire events. (2) Fire weather The term fire weather means the weather conditions that influence the start, spread, character, or behavior of wildfires or fires at the wildland-urban interface and relevant meteorological and chemical phenomena, including air quality, smoke, and meteorological parameters such as relative humidity, air temperature, wind speed and direction, and atmospheric composition and chemistry, including emissions and mixing heights.