Comprehensive　observations　of　ambient　volatile　organic　compounds　(VOCs)　were　conducted　in　Beijing　(the　capital　of　China)　in　the　summer　of　2018　with　high　temporal　resolution,　and　the　compositions,　sources,　ozone　formation　potential　(OFP),　and　secondary　organic　aerosol　formation　potential　(SOAP)　were　examined.　A　high　mixing　ratio　of　total　VOCs　(TVOCs)　(26.6　±　9.5　ppbv)　was　observed　in　this　study,　which　was　similar　to　that　obtained　in　2014　and　2016　in　Beijing.　The　dominant　components　were　alkanes　(51.1%　of　TVOCs),　alkenes　(24.1%),　and　aromatics　(19.5%).　According　to　backward　trajectories　and　potential　source　contribution　function　analysis,　medium-distance　transport　from　the　south　of　the　sampling　region　contributed　more　than　50%　of　the　trajectories,　and　the　potential　source　regions　were　mainly　located　in　Shandong　and　Hebei　Provinces.　The　seven　sources　identified　by　the　positive　matrix　factorization　receptor　model　included　natural/liquified　petroleum　gas　(NG/LPG)　usage　and　gasoline　evaporation　(21.68%),　solvent　usage　(20.14%),　combustion　sources　(16.07%),　industrial　emissions　(15.24%),　diesel　exhaust　(14.89%),　gasoline　exhaust　(6.05%),　and　biological　emissions　(5.92%).　Alkenes　(50.05%)　and　aromatics　(36.20%)　contributed　the　most　to　the　total　OFP,　whereas　aromatics　contributed　more　than　90.00%　to　the　total　SOAP.　The　source　with　the　greatest　contribution　to　OFP　and　SOAP　was　solvent　usage,　the　contribution　of　which　exceeded　50%.　The　results　of　this　study　are　favorable　for　the　development　of　control　strategies　for　VOCs　and　for　reducing　the　formation　of　photochemical　smog　and　secondary　particulate　matter.　©　2023　Turkish　National　Committee　for　Air　Pollution　Research　and　Control