air quality

Recent events have highlighted significant air quality issues in urban areas. In Washington D.C., an extensive Fourth of July fireworks display temporarily resulted in the city experiencing the world's worst air quality among major cities, with residents breathing "unhealthy" air. This occurred amidst ongoing environmental policy changes. Separately, a massive warehouse fire in Los Angeles' Boyle Heights neighborhood released thick black smoke for a week, causing a state of emergency and evacuations due to deteriorating air quality. The fire, which destroyed a significant portion of 85 million pounds of frozen food, left residents complaining of a foul odor. These incidents underscore the immediate and severe impact of large-scale events, whether celebratory or accidental, on urban air quality and public health.