{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T17:56:18Z","timestamp":1770832578767,"version":"3.50.1"},"reference-count":46,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2020,1,10]],"date-time":"2020-01-10T00:00:00Z","timestamp":1578614400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Romanian Ministry of Research and Innovation","award":["10PFE\/16.10.2018, PERFORM-TECH-UPT"],"award-info":[{"award-number":["10PFE\/16.10.2018, PERFORM-TECH-UPT"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Air quality in urban environments has become a central issue of our present society as it affects the health and lives of the population all over the world. The first step in mitigating negative effects is proper measurement of the pollution level. This work presents a portable air pollution measurement system, built from off-the-shelf devices, that is designed to assure user privacy and data authenticity. Data is collected from sensor modules that can be hand carried or installed on vehicles, possibly leading to a vehicular sensor network that may cover a larger area. The main challenge is to provide authenticity for the sensor data while also ensuring user privacy. The proposed system assures authenticity and non-repudiation for the collected data by using group signatures and a blockchain-like structure for secure storage. We use regular key-exchange protocols based on elliptic curve cryptography in order to securely bootstrap a session key, then we benefit from secure tunneling to export data from sensors to the remote server. Post-update tampering is prevented by the use of a blockchain-like structure on the data server. We carry experiments both to determine the computational requirements of the procedures, as well as to measure indicators of air quality on nearby areas.<\/jats:p>","DOI":"10.3390\/s20020403","type":"journal-article","created":{"date-parts":[[2020,1,13]],"date-time":"2020-01-13T04:05:51Z","timestamp":1578888351000},"page":"403","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["A Secure and Portable Multi-Sensor Module for Distributed Air Pollution Monitoring"],"prefix":"10.3390","volume":"20","author":[{"given":"Gyorgy","family":"Kolumban-Antal","sequence":"first","affiliation":[{"name":"Faculty of Automatics and Computers, Politehnica University of Timisoara, Timisoara 300223, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vladko","family":"Lasak","sequence":"additional","affiliation":[{"name":"Faculty of Automatics and Computers, Politehnica University of Timisoara, Timisoara 300223, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6495-3239","authenticated-orcid":false,"given":"Razvan","family":"Bogdan","sequence":"additional","affiliation":[{"name":"Faculty of Automatics and Computers, Politehnica University of Timisoara, Timisoara 300223, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3078-3635","authenticated-orcid":false,"given":"Bogdan","family":"Groza","sequence":"additional","affiliation":[{"name":"Faculty of Automatics and Computers, Politehnica University of Timisoara, Timisoara 300223, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,10]]},"reference":[{"key":"ref_1","unstructured":"Salvi, C., and Brickman, S. (2019, December 14). Air Pollution Costs European Economies US$ 1.6 Trillion a Year in Diseases and Deaths. Available online: http:\/\/www.euro.who.int\/en\/media-centre\/sections\/press-releases\/2015\/04\/air-pollution-costs-european-economies-us$-1.6-trillion-a-year-in-diseases-and-deaths,-new-who-study-says."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1016\/j.jenvman.2019.06.090","article-title":"An overview of the development of vertical sampling technologies for ambient volatile organic compounds (VOCs)","volume":"247","author":"Hien","year":"2019","journal-title":"J. Environ. Manag."},{"key":"ref_3","unstructured":"Re, G.L., Peri, D., and Vassallo, S.D. (2014). Urban air quality monitoring using vehicular sensor networks. Advances onto the Internet of Things, Springer."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1016\/j.envint.2014.11.019","article-title":"The rise of low-cost sensing for managing air pollution in cities","volume":"75","author":"Kumar","year":"2015","journal-title":"Environ. Int."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3253","DOI":"10.1109\/TIM.2009.2022372","article-title":"Smart Sensors Network for Air Quality Monitoring Applications","volume":"58","author":"Postolache","year":"2009","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1441","DOI":"10.1007\/s13762-017-1521-x","article-title":"Study on particulate matter dispersion by correlating direct measurements with numerical simulations: Case study\u2014Timisoara urban area","volume":"15","author":"Lungu","year":"2018","journal-title":"Int. J. Environ. Sci. Technol."},{"key":"ref_7","unstructured":"Xiang, Y. (2014). Mobile Sensor Network Design and Optimization for Air Quality Monitoring. [Ph.D. Thesis, University of Michigan]."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Xiang, Y., Piedrahita, R., Dick, R.P., Hannigan, M., Lv, Q., and Shang, L. (2013, January 21\u201323). A Hybrid Sensor System for Indoor Air Quality Monitoring. Proceedings of the 2013 IEEE International Conference on Distributed Computing in Sensor Systems, Cambridge, MA, USA.","DOI":"10.1109\/DCOSS.2013.48"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Huang, Q., Mao, C., and Chen, Y. (2017, January 25\u201327). A Compact and Versatile Wireless Sensor Prototype for Affordable Intelligent Sensing and Monitoring in Smart Buildings. Proceedings of the ASCE International Workshop on Computing in Civil Engineering 2017, Seattle, WA, USA.","DOI":"10.1061\/9780784480830.020"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"882","DOI":"10.1109\/TVT.2008.928899","article-title":"Dissemination and Harvesting of Urban Data Using Vehicular Sensing Platforms","volume":"58","author":"Lee","year":"2009","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2005","DOI":"10.1016\/j.jss.2011.06.043","article-title":"Measuring air quality in city areas by vehicular wireless sensor networks","volume":"84","author":"Hu","year":"2011","journal-title":"J. Syst. Softw."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1109\/TVT.2015.2388851","article-title":"Prefetching-Based Data Dissemination in Vehicular Cloud Systems","volume":"65","author":"Kim","year":"2016","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2723","DOI":"10.1109\/TWC.2017.2658601","article-title":"Optimal WSN Deployment Models for Air Pollution Monitoring","volume":"16","author":"Boubrima","year":"2017","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"7234","DOI":"10.1109\/TVT.2017.2655084","article-title":"Efficient Data Gathering and Estimation for Metropolitan Air Quality Monitoring by Using Vehicular Sensor Networks","volume":"66","author":"Wang","year":"2017","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Lai, Y., Yang, F., Su, J., Zhou, Q., Wang, T., Zhang, L., and Xu, Y. (2018). Fog-Based Two-Phase Event Monitoring and Data Gathering in Vehicular Sensor Networks. Sensors, 18.","DOI":"10.3390\/s18010082"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1016\/j.comnet.2017.08.014","article-title":"Vehicle location service scheme based on road map in Vehicular Sensor Networks","volume":"127","author":"Yim","year":"2017","journal-title":"Comput. Netw."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"5570","DOI":"10.1109\/TVT.2018.2818190","article-title":"A Quality-Oriented Data Collection Scheme in Vehicular Sensor Networks","volume":"67","author":"Nie","year":"2018","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_18","unstructured":"Devarakonda, S., Sevusu, P., Liu, H., Liu, R., Iftode, L., and Nath, B. Real-time air quality monitoring through mobile sensing in metropolitan areas. Proceedings of the 2nd ACM SIGKDD International Workshop on Urban Computing."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1145\/1053283.1053287","article-title":"Establishing pairwise keys in distributed sensor networks","volume":"8","author":"Liu","year":"2005","journal-title":"ACM Trans. Inf. Syst. Secur. (TISSEC)"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Liu, A., and Ning, P. (2008, January 22\u201324). TinyECC: A configurable library for elliptic curve cryptography in wireless sensor networks. Proceedings of the 7th International Conference on Information Processing in SENSOR Networks, St. Louis, MO, USA.","DOI":"10.1109\/IPSN.2008.47"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Koblitz, N., and Menezes, A. (2005, January 19\u201321). Pairing-based cryptography at high security levels. Proceedings of the IMA International Conference on Cryptography and Coding, Cirencester, UK.","DOI":"10.1007\/11586821_2"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1606","DOI":"10.1109\/TVT.2009.2038222","article-title":"A scalable robust authentication protocol for secure vehicular communications","volume":"59","author":"Zhang","year":"2009","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Wasef, A., and Shen, X. (2010, January 23\u201327). Efficient group signature scheme supporting batch verification for securing vehicular networks. Proceedings of the 2010 IEEE International Conference on Communications, Cape Town, South Africa.","DOI":"10.1109\/ICC.2010.5502136"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"907","DOI":"10.1109\/TVT.2013.2294032","article-title":"Efficient privacy-preserving authentication for vehicular ad hoc networks","volume":"63","author":"Zhu","year":"2013","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Wu, L., Fan, J., Xie, Y., Wang, J., and Liu, Q. (2017). Efficient location-based conditional privacy-preserving authentication scheme for vehicle ad hoc networks. Int. J. Distrib. Sens. Netw., 13.","DOI":"10.1177\/1550147717700899"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"8647","DOI":"10.1109\/TVT.2018.2839979","article-title":"Decentralized and scalable privacy-preserving authentication scheme in VANETs","volume":"67","author":"Tangade","year":"2018","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Boneh, D., Boyen, X., and Shacham, H. (2004, January 15\u201319). Short group signatures. Proceedings of the Annual International Cryptology Conference, Santa Barbara, CA, USA.","DOI":"10.1007\/978-3-540-28628-8_3"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1319","DOI":"10.1109\/TITS.2015.2502322","article-title":"An Efficient Conditional Privacy-Preserving Authentication Scheme for Vehicular Sensor Networks Without Pairings","volume":"17","author":"Lo","year":"2016","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"5409","DOI":"10.1109\/TVT.2018.2822768","article-title":"A Secure and Efficient Authentication Technique for Vehicular Ad-hoc Networks","volume":"67","author":"Asaar","year":"2018","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Li, C., Zhang, X., Wang, H., and Li, D. (2018). An Enhanced Secure Identity-Based Certificateless Public Key Authentication Scheme for Vehicular Sensor Networks. Sensors, 18.","DOI":"10.3390\/s18010194"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Cui, J., Xu, W., Zhong, H., Zhang, J., Xu, Y., and Liu, L. (2018). Privacy-Preserving Authentication Using a Double Pseudonym for Internet of Vehicles. Sensors, 18.","DOI":"10.3390\/s18051453"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1016\/j.comnet.2018.03.010","article-title":"Trust-based security adaptation mechanism for Vehicular Sensor Networks","volume":"137","author":"Javed","year":"2018","journal-title":"Comput. Netw."},{"key":"ref_33","first-page":"19","article-title":"A survey on authentication schemes in VANETs for secured communication","volume":"9","author":"Manvi","year":"2017","journal-title":"Veh. Commun."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"31808","DOI":"10.1109\/ACCESS.2018.2845464","article-title":"Efficient Pairing-Free Certificateless Authentication Scheme With Batch Verification for Vehicular Ad-Hoc Networks","volume":"6","author":"Gayathri","year":"2018","journal-title":"IEEE Access"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Dai, F., Luo, M., and ZHANG, Y. (2017). A Fault-Tolerant Batch Verification Scheme for Cloud Assisted VANETs. DEStech Trans. Eng. Technol. Res.","DOI":"10.12783\/dtetr\/ameme2017\/16245"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.future.2017.07.002","article-title":"A robust and efficient password-based conditional privacy preserving authentication and group-key agreement protocol for VANETs","volume":"84","author":"Islam","year":"2018","journal-title":"Future Gener. Comput. Syst."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"26307","DOI":"10.1109\/ACCESS.2018.2834224","article-title":"A Realistic Distributed Conditional Privacy- Preserving Authentication Scheme for Vehicular Ad Hoc Networks","volume":"6","author":"Liu","year":"2018","journal-title":"IEEE Access"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Ming, Y., and Shen, X. (2018). PCPA: A Practical Certificateless Conditional Privacy Preserving Authentication Scheme for Vehicular Ad Hoc Networks. Sensors, 18.","DOI":"10.3390\/s18051573"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1861","DOI":"10.1007\/s12652-017-0650-x","article-title":"Efficient identity-based data transmission for VANET","volume":"9","author":"Wan","year":"2017","journal-title":"J. Ambient. Intell. Humaniz. Comput."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"10626","DOI":"10.1109\/TVT.2017.2744182","article-title":"Anonymous and Lightweight Authentication for Secure Vehicular Networks","volume":"66","author":"Ying","year":"2017","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_41","unstructured":"(2019, July 24). CO2 Earth. Available online: https:\/\/www.co2.earth\/."},{"key":"ref_42","first-page":"173","article-title":"On cancer risk estimation of urban air pollution","volume":"102","author":"Ehrenberg","year":"1994","journal-title":"Environ. Health Perspect."},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Tsai, W.T. (2016). Toxic Volatile Organic Compounds (VOCs) in the Atmospheric Environment: Regulatory Aspects and Monitoring in Japan and Korea. Environments, 3.","DOI":"10.3390\/environments3030023"},{"key":"ref_44","unstructured":"Kolumban-Antal, G., Lasak, V., Bogdan, R., and Groza, B. (2018, January 23\u201326). Air pollution monitoring with secure low-cost Vehicular Sensor Networks. Proceedings of the 1st International Conference on Computational Methods and Applications in Engineering, Timisoara, Romania."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1007\/BF00124891","article-title":"Authentication and authenticated key exchanges","volume":"2","author":"Diffie","year":"1992","journal-title":"Des. Codes Cryptogr."},{"key":"ref_46","unstructured":"Unterluggauer, T., and Wenger, E. (2014, January 23\u201326). Efficient pairings and ECC for embedded systems. Proceedings of the International Workshop on Cryptographic Hardware and Embedded Systems, Busan, Korea."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/2\/403\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:19:28Z","timestamp":1760361568000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/2\/403"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,1,10]]},"references-count":46,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2020,1]]}},"alternative-id":["s20020403"],"URL":"https:\/\/doi.org\/10.3390\/s20020403","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,1,10]]}}}