A particulate matter sensor device comprising: an enclosure defining a flow channel for guiding a flow of an aerosol sample through the particulate matter sensor device, the enclosure defining a primary flow inlet into the flow channel; a radiation source for emitting radiation into the flow channel for interaction of the radiation with particulate matter in the aerosol sample in the flow channel; a radiation detector for detecting at least part of said radiation after interaction with the particulate matter; and at least one additional flow opening (511, 511a, 512, 513, 514) arranged and configured to create an additional flow into the flow channel so that it sheaths the radiation detector and/or the radiation source, wherein the particulate matter sensor device comprises a filter for filtering the additional flow, characterized in that the particulate matter sensor device comprises an environmental sensor disposed in a flow path of the additional flow upstream of the additional flow opening (511, 511a, 512, 513, 514) and downstream of the filter, the environmental sensor being configured to determine at least one environmental parameter, the at least one environmental parameter being at least one of: a temperature; a humidity; and a concentration of one or more target gases, in particular, a concentration of a mixture of gases or a concentration of one or more individual gases, in that the radiation detector is arranged in a flow path of the additional flow downstream of the environmental sensor, and in that the radiation detector and the environmental sensor are mounted on a common circuit board. an enclosure defining a flow channel for guiding a flow of an aerosol sample through the particulate matter sensor device, the enclosure defining a primary flow inlet into the flow channel; a radiation source for emitting radiation into the flow channel for interaction of the radiation with particulate matter in the aerosol sample in the flow channel; a radiation detector for detecting at least part of said radiation after interaction with the particulate matter; and at least one additional flow opening (511, 511a, 512, 513, 514) arranged and configured to create an additional flow into the flow channel so that it sheaths the radiation detector and/or the radiation source, wherein the particulate matter sensor device comprises a filter for filtering the additional flow, characterized in that the particulate matter sensor device comprises an environmental sensor disposed in a flow path of the additional flow upstream of the additional flow opening (511, 511a, 512, 513, 514) and downstream of the filter, the environmental sensor being configured to determine at least one environmental parameter, the at least one environmental parameter being at least one of: a temperature; a humidity; and a concentration of one or more target gases, in particular, a concentration of a mixture of gases or a concentration of one or more individual gases, in that the radiation detector is arranged in a flow path of the additional flow downstream of the environmental sensor, and in that the radiation detector and the environmental sensor are mounted on a common circuit board. a temperature; a humidity; and a concentration of one or more target gases, in particular, a concentration of a mixture of gases or a concentration of one or more individual gases, in that the radiation detector is arranged in a flow path of the additional flow downstream of the environmental sensor, and in that the radiation detector and the environmental sensor are mounted on a common circuit board.