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A REACT-LC sub-study

As part of the REACT-LC study we are exploring the impact of environmental factors on Long COVID and other health outcomes, and this study will provide additional data for that analysis. 

Starting in early 2026, REACT Study participants who live in London may be invited to join the Indoor Air Quality Measurements and Modelling in London Homes (IAQM) study. The project team hopes to enrol participants from a wide range of backgrounds. It is entirely up to you whether you decide to participate in IAQM. If you choose not to join, it will not affect your participation in the REACT Study or any future research opportunities you might be invited to as a member of the REACT study.

To take part, please follow the instructions in your email invitation. 

What is involved?  

1. We will ask you to complete a questionnaire about your home environment and yourself (Phase I). From everyone who completes the questionnaire, we will select about 50 participants based on their housing type to host three new air‑quality devices in their homes for a month (Phase II). 

2. If your home is selected, we will send you three small air quality monitoring devices along with clear instructions via post. You will be asked to unpack and place the devices in your kitchen, living room, and bedroom for a four-week period. After that, you will package the devices, apply our label and send back to us. 

Our research team has developed these compact devices to measure air pollution, temperature, humidity, and mould levels inside the home (as shown in the picture below). The devices are designed to be easy to use — they do not require a power cable or Wi-Fi connection. 

Will I receive feedback?

You and your family will be invited to participate in a 3-hour online workshop. The workshop will provide an overview of air pollution and its health impacts, explain the aims of this project, and summarise our findings on indoor air pollution exposure and their implications. It will also include an interactive session on practical mitigation strategies, with opportunities for participants to share experiences, ask questions, and discuss implementation challenges. 

If you are selected to host a device in your home, we will compensate you with a £50 Amazon voucher as a thank you for your participation. Furthermore, once we have processed the data, we will provide you with a summary report of the data gathered in your home. Together with the report, we will also provide advice and information as to how to reduce personal exposure to harmful pollutants, as well as details about who you can contact to receive further advice an information on how to reduce the identified sources of pollution.   

If you have received an email invitation from , our records show that you have previously participated in a REACT Study, gave us permission to contact you about future research opportunities and live in London. 

More information can be found in the DTA participant information sheet: IAQM_PIS_v1.2

If you have questions or need support, please contact the IAQM study team at: iaqm.study-WP@groups.imperial.ac.uk 

If you prefer to get in touch with the REACT study team, please contact us at react.study@imperial.ac.uk.