Analyze the impact of air quality on workout performance, recovery, and long-term health outcomes. Focus on [CITY/REGION], where pollution levels are [HIGH/MODERATE/LOW], and provide data-backed recommendations for [ATHLETES/CASUAL GYM-GOERS/OUTDOOR ENTHUSIASTS]. Include metrics like VO2 max, heart rate variability, and lung function. Discuss mitigation strategies such as [INDOOR AIR FILTERS/WORKOUT TIMING/MASK USAGE] and their effectiveness. Cite at least [3-5] peer-reviewed studies to support your conclusions.