The　concentrations　of　ozone(O3),　nitrogen　oxides　(NOx),　carbon　monoxide　(CO)　and　volatile　organic　compounds　(VOCs)　were　monitored　at　the　boundary　of　a　coking　factory　in　the　northern　China　from　June　to　October　2012.　The　monitoring　data　revealed　that　O3,　NO,　and　CO　showed　a　diurnal　variation　of　single　peak.　The　concentration　of　O3　was　slightly　higher　in　summer　than　that　in　autumn,　while　the　concentrations　of　NO　and　CO　was　greatly　lower　in　summer　than　those　in　autumn.　In　terms　of　NO2,　its　diurnal　variation　was　much　larger　in　autumn　than　that　in　summer.　And　for　TVOCs,　its　hourly　concentration　increased　firstly　and　then　decreased　in　summer,　while　in　autumn　showed　the　continuous　decrease　trend.　It　can　be　concluded　that　this　area　was　VOC-sensitive　regime,　due　to　the　small　ratio　of　VOCs/NOx.　The　concentrations　of　TVOCs　were　(43.8±45.0)×10-9　in　summer　and　(26.7±29.6)×10-9　in　autumn,　in　which　the　concentrations　of　aromatics,　alkanes,　alkenes　were　(34.3±28.1)×10-9,　(14.4±14.8)×10-9,　(5.3±11.8)×10-9　in　summer　and　(7.0±7.7)×10-9,　(4.3±5.0)×10-9　and　(5.3±7.1)×10-9　in　autumn,　respectively.　The　contributions　of　ozone　formation　potentials　(OFP)　of　aromatics,　alkanes,　alkenes　were　estimated　to　be　47.6%~65.8%,　28.0%~41.9%　and　6.3%~10.5%,　respectively.