A transmitter device 10 is arranged to obtain and transmit environmental information. A receiver device 20 is arranged to receive environmental information from one or more transmitter devices 10. The receiver device 20 is arranged to combine the received environmental information and may be arranged to determine a pollution exposure based on the combined environmental information. In this way, an action may be taken in response to the determined pollution exposure to reduce health risks. Multiple vehicle emission measurements may be shared within a geographical area for pollution mapping at locations where direct measurement is not available. V2X based ad-hoc communication may be used to share the environmental information.
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