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Air quality was a vital concern for the Beijing Olympic Games in 2008. To strictly control air pollutant emissions and ensure good air quality for the Games, Beijing municipal government announced an “Air Quality Guarantee Plan for the 29th Olympics in Beijing”. In order to evaluate the effectiveness of the guarantee plan, this study analyzed the air pollutant emission reductions during the 29th Olympiad in Beijing. In June 2008, daily emissions of SO₂, NO_X, PM₁₀, and NMVOC in Beijing were 103.9 t, 428.5 t, 362.7 t, and 890.0 t, respectively. During the Olympic Games, the daily emissions of SO₂, NO_X, PM₁₀, and NMVOC in Beijing were reduced to 61.6 t, 229.1 t, 164.3 t, and 381.8 t −41%, 47%, 55%, and 57% lower than June 2008 emission levels. Closing facilities producing construction materials reduced the sector’s SO₂ emissions by 85%. Emission control measures for mobile sources, including high-emitting …