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This study aims to predict human exposure to pollutants and heating load in buildings by developing a numerical model coupling heat and chemical transfers in the building envelope. The study characterizes the effect of temperature and air renewal rate on chemical emissions from building materials and human exposure. The results show that increasing indoor temperature by 10°C doubles the maximum indoor air concentration of volatile and semi-volatile organic compounds, leading to increased human exposure. The study also finds that higher air renewal rates lead to smaller intake fractions of pollutants from building materials. The study highlights the need to guide early design choices towards a good compromise between human indoor exposure and heating load, especially with the increasing emphasis on energy-efficient building design.

This is a pre-print manuscript pending publication in open access scientific journals.

This document has been developed within the framework of the Global Environment Facility (GEF) project ID: 9771 on Global Best Practices on Emerging Chemical Policy Issues of Concern under the Strategic Approach to International Chemicals Management (SAICM).

The study examines the near-field exposures and health risks of organic chemicals in interior paints commonly used in Sri Lanka. The researchers developed mass balance-based and high-throughput models to predict chemical emissions during wet and dry phases and integrated these models into the USEtox model for health risk assessment. The models accurately predicted indoor air concentrations and drying time. They found that inhalation is the primary exposure pathway, and exposure is much higher for painters during application than for household members during use. The study identified chemicals of concern and recommended the use of protective equipment for painters and increasing air ventilation rates to reduce exposure for household members.

This is a pre-print manuscript pending publication in open access scientific journals.

This document has been developed within the framework of the Global Environment Facility (GEF) project ID: 9771 on Global Best Practices on Emerging Chemical Policy Issues of Concern under the Strategic Approach to International Chemicals Management (SAICM).

Digital collection of tools and guides to help designers, architects, homeowners, and developers make more informed choices about building materials and health.

More than 100 product guides to support practitioners in selecting products that avoid negative health impacts.

Platform with aggregated information on human health and environmental impacts for products from leading manufacturers, vetted by experts against a sustainability criteria baseline.

Strengthening legal efforts in Nigeria is crucial for successful implementation of Extended Producer Responsibility (EPR) systems. By having the National Environmental Standards and Regulations Enforcement Agency of Nigeria (NESREA) having the enforcing EPR laws create a more sustainable and accountable e-waste sector.

Developing and updating EPR legistlations helps clarify the different responsibilities and enforce producers to comply with their obligations and responsibility. However, effective EPR implementation will require further law enforcement measures.
The case study outlines two achievements of the "Circular Economy Approaches for The Electronics Sector In Nigeria" project towards establishing a stronger legal system in Nigeria:

• The development and gazette of the EPR Guidance document in 2020: the guidance defines the roles and responsibilities of the key public and private stakeholders, the product categories to be covered by the EPR scheme, and the collection and recycling targets.
• The amendment of the National Environmental (Electrical and Electronic Sector) Regulations in 2022: which legally requires EPR subscriptions and prohibits suboptimal treatment of e-waste.

The study concludes with a summary of key lessons and next steps, emphasizing the importance of enforcing EPR laws, engaging stakeholders, raising public awareness, and collaborating with regional and international partners.

The establishment of an EPR database is critical in operationalising and formalising the management of EPR-related data. The EPR database allows e-waste flow tracking and EPR fee and recovery rate calculation while ensuring producers' information confidentiality and helping prevent counterfeiting activities.

The case study outlines the project’s efforts towards establishing this automation system in Nigeria in the following areas:

• Developing the EPR database: to manage producers’ market share data, calculate and collect the EPR fees.
• Registering Producers and products in the database: To ensure electronic and electrical producers are registered and to oversee the EPR operation.
• Securing the database: Enhancing producers' trust in the database and ensuring its confidentiality.

The study concludes with a summary of next steps and key learnings, emphasizing the importance of law enforcement, database registration, secure systems for producers, and encouraging the participation of producers in the database registration.

Over half a million tonnes of discarded electronic appliances are improperly processed in Nigeria every year, threatening the country's environment and the health of approximately 100,000 informal workers in the recycling industry.
With support from the Global Environment Facility (GEF), the Government of Nigeria has joined forces with the United Nations Environment Programme (UNEP) and partners to turn the tide on e-waste under the “Circular Economy Approaches for the Electronics Sector in Nigeria” project. Led by UNEP and supported by the National Environmental Standards and Regulations Enforcement Agency of Nigeria (NESREA), the $15-million initiative brought together players from the Government, the private sector, and civil society to design and operationalise a financially self-sustaining circular economy (CE) for electronics in Nigeria.
The project aims to stimulate a CE pilot through an Extended Producer Responsibility (EPR) scheme that serves as a model for countries facing similar challenges. EPR is an integrated waste management approach that extends the responsibility of manufacturers to the entire lifecycle of their product, particularly to the end-of-life treatment. By applying this approach, the producers will be obliged to commission for collecting, pre-treating and recycling their originated e-waste. 
The project creates synergies among pre-existing elements of an EPR system in Nigeria to establish a sustainable management system and financing mechanism for EPR implementation. Establishing and enforcing a sustainable approach in Nigeria with supporting regulations and legally binding requirements is expected to recover and re-introduce usable materials into the value chain, dispose of hazardous e-waste streams in an environmentally sound manner, and create safe employment for Nigerian e-waste workers.