This study investigates China's air quality monitoring rollout, showing that increased pollution salience prompts financial analysts to produce more environmental research. This leads to market repricing, with brown firms facing valuation losses and green firms seeing gains, representing 5% of total market capitalisation and enhancing price efficiency.

This research provides causal evidence that long-term exposure to fine particulate matter at contemporary levels increases circulatory morbidity, particularly hypertension. Using a quasi-random assignment of U.S. Army soldiers, the study demonstrates that sustained exposure erodes health capital, even in young, initially healthy populations, highlighting the risks of chronic pollution.

This report introduces a practical framework for integrating health co-benefits into urban climate monitoring. It details a five-step process for selecting robust indicators across air pollution, active travel, and sustainable diets. The framework helps cities justify climate policies, enhance accountability, and strengthen public support through evidence-based decision-making.

This NBER working paper examines the impact of air pollution on 10 million US high school students. It finds that moderate pollution levels reduce annual learning by 19 per cent. Disadvantaged students experience three times more harm, significantly widening racial and socio-economic achievement gaps.

This research examines Brazil's vehicle tax exemptions, finding that lower age thresholds increase fleet age, pollution and infant health risks. It identifies a 'political environmental trap', where raising exemption ages leads to significant electoral penalties for incumbents, despite the policies resulting in a net welfare loss.

This report examines how 24 European banks provided US$41.9 billion to gas power developers between 2021 and 2024. It highlights significant health impacts, including nearly 3,000 premature deaths in Europe, and warns that expanding gas infrastructure undermines global climate targets and exposes economies to price volatility.

This NBER working paper quantifies the environmental costs of US data centre electricity use in 2025. Using facility-level data for approximately 2,800 data centres, it estimates gross external damages of $24.6 billion from air pollution and greenhouse gas emissions, with Texas and Virginia accounting for 30% of the national total.

This policy brief presents findings from the third update to the Airport Tracker, a global inventory covering the world's 1,300 busiest airports. Using 2023 data, it analyses CO₂ and local air pollution from passenger, freight and private jet flights, finding that aviation remains off track to meet net-zero goals.

China’s PM₂.₅-targeted regulation reduced particulates but increased O₃ via pollutant substitution driven by incentive distortions. Resulting ozone rises increased mortality and reduced biodiversity, offsetting ~24% of policy benefits. Findings highlight welfare losses from narrow performance metrics and the need for multi-pollutant regulation.

The World Air Quality Report is an annual research series assessing global air quality using ground-level PM2.5 monitoring data. It provides consistent country, regional and city-level comparisons, supported by transparent methodology and harmonised datasets to inform policy, research and investment analysis.

The IQAir × UNEP air quality tool aggregates real-time PM2.5 data from thousands of monitors worldwide to show current air pollution exposure and estimates by age group, relative to WHO guidelines. It supports global air quality assessment through an interactive map and hourly updated exposure statistics.

UNEP’s Ozone Secretariat portal supports implementation of the Montreal Protocol by providing access to data, reports, legal texts and compliance resources on ozone-depleting substances (ODS). It aids national authorities and stakeholders in tracking ODS phase-out and supporting global efforts to protect and restore the ozone layer.

IQAir is a commercial air quality technology company providing real-time air pollution data, analytics and monitoring solutions. It operates a global air quality platform, publishes World Air Quality Reports, and supplies air monitoring hardware. IQAir data supports public health, environmental research, urban planning and policy decision-making worldwide across multiple regions.

This study analyses 202 US cities, linking historic redlining to higher present-day cumulative environmental burdens. Using EJScreen data and modelling, it finds redlined neighbourhoods face significantly greater combined pollution exposures, particularly from traffic, hazardous waste and wastewater sites, with strongest disparities in western regions.

Greenpeace East Asia is a regional environmental campaigning organisation focused on climate change, toxic pollution, sustainable food, forests and ocean protection across East Asia. Active since 1997, it conducts research, advocacy and non-violent campaigns to influence policy and promote renewable energy and environmental sustainability.

The report estimates premature mortality, years of life lost and asthma cases in the EU and UK attributable to indoor nitrogen dioxide from gas cooking. Using modelling of indoor exposures and concentration–response functions, it quantifies associated economic costs and highlights potential health gains from transitioning to cleaner cooking energy