Haze

: Dry seasons, low rainfall, and weather patterns like El Niño can exacerbate the frequency and intensity of haze events. 3. Key Impacts EXECUTIVE SUMMARY - ASEAN

: Large-scale forest and land fires release dense smoke and particulate matter. : Dry seasons, low rainfall, and weather patterns

: Vehicle exhausts, industrial activities, and the burning of fossil fuels release nitrogen dioxide ( NO2cap N cap O sub 2 ) and sulfur dioxide ( SO2cap S cap O sub 2 ), which react to form sulfates and other fine particles. : Dry seasons