Night ventilation, or night flushing, works best in climates where daytime and nighttime temperatures are similar. True False Question 3 (1 point) An urban heat island is: a city in the developing world that lacks air conditioning an isolated city the phenomenon in which cities are several degrees warmer than the surrounding area an urban area with increased exposure to solar radiation Question 4 (1 point) Sustainable urbanism includes broad streets with expansive block sizes networks of streets with small blocks and frequent intersections.