Air Quality Atmosphere and Health

Article	Citations
Impact of lockdown on air quality in India during COVID-19 pandemic	225
COVID-19: air pollution remains low as people stay at home	204
A brief review of socio-economic and environmental impact of Covid-19	184
Climate comfort depending on different altitudes and land use in the urban areas in Kahramanmaras City	112
Does the inflow of remittances and energy consumption increase CO2 emissions in the era of globalization? A global perspective	103
Valuation of air pollution externalities: comparative assessment of economic damage and emission reduction under COVID-19 lockdown	101
Fluctuations in environmental pollutants and air quality during the lockdown in the USA and China: two sides of COVID-19 pandemic	88
Co-variance nexus between COVID-19 mortality, humidity, and air quality index in Wuhan, China: New insights from partial and multiple wavelet coherence	78
Environmental pollution and COVID-19 outbreak: insights from Germany	73
Air pollution and its health impacts in Malaysia: a review	73
The impact of COVID-19 lockdown on the air quality of Eastern Province, Saudi Arabia	68
Microplastics as emerging atmospheric pollutants: a review and bibliometric analysis	64
Comparative study on air quality status in Indian and Chinese cities before and during the COVID-19 lockdown period	63
European Union policies and their role in combating climate change over the years	59
Air pollution improvement and mortality rate during COVID-19 pandemic in India: global intersectional study	58
UK COVID-19 lockdown: 100 days of air pollution reduction?	56
Transport CO2 emissions, drivers, and mitigation: an empirical investigation in India	55
Emission reduction of black carbon and polycyclic aromatic hydrocarbons during COVID-19 pandemic lockdown	53
Integrating of settlement area in urban and forest area of Bartin with climatic condition decision for managements	53
Decoupling the climatic and carbon dioxide emission influence to maize crop production in Pakistan	49
Temporal variability of atmospheric particulate-bound polycyclic aromatic hydrocarbons (PAHs) over central east India: sources and carcinogenic risk assessment	45
A spatial econometric empirical research on the impact of industrial agglomeration on haze pollution in China	43
Has air quality improved in Ecuador during the COVID-19 pandemic? A parametric analysis	43
Calculation of comfortable thermal conditions for Mersin urban city planning in Turkey	42
Air quality improvement from COVID-19 lockdown: evidence from China	41

Viral respiratory infections and air pollutants	41
Impacts of nationwide lockdown due to COVID-19 outbreak on air quality in Bangladesh: a spatiotemporal analysis	41
Monitoring, analysis and spatial and temporal zoning of air pollution (carbon monoxide) using Sentinel-5 satellite data for health management in Iran, located in the Middle East	39
Biological contaminants in the indoor air environment and their impacts on human health	39
Epigrammatic study on the effect of lockdown amid Covid-19 pandemic on air quality of most polluted cities of Rajasthan (India)	39
Consequences of COVID-19 on the social isolation of the Chinese economy: accounting for the role of reduction in carbon emissions	37
Using indoor plants as biomonitors for detection of toxic metals by tobacco smoke	36
Short-term impact of PM2.5, PM10, and PMc on mortality and morbidity in the agglomeration of Warsaw, Poland	35
Applicability of machine learning in modeling of atmospheric particle pollution in Bangladesh	34
The association between COVID-19 deaths and short-term ambient air pollution/meteorological condition exposure: a retrospective study from Wuhan, China	34
Inactivation times from 290 to 315 nm UVB in sunlight for SARS coronaviruses CoV and CoV-2 using OMI satellite data for the sunlit Earth	33
How is COVID-19 affecting environmental pollution in US cities? Evidence from asymmetric Fourier causality test	33
Atmospheric micro (nano) plastics: future growing concerns for human health	33
A study on variation of atmospheric pollutants over Bhubaneswar during imposition of nationwide lockdown in India for the COVID-19 pandemic	32
Predictive analysis of CO2 emissions and the role of environmental technology, energy use and economic output: evidence from emerging economies	31
A support vector machine model to forecast ground-level PM2.5 in a highly populated city with a complex terrain	30
Air quality data series estimation based on machine learning approaches for urban environments	30
Particulate matter and foliar retention: current knowledge and implications for urban greening	29
Association of COVID-19 distribution with air quality, sociodemographic factors, and comorbidities: an ecological study of US states	28
Effect of COVID-19 outbreak on urban health and environment	28
The impacts of COVID-19 measures on global environment and fertility rate: double coincidence	27
Impact of novel coronavirus (COVID-19) on daily routines and air environment: evidence from Turkey	26
Particulate matter (PM10 and PM2.5) concentrations during a Saharan dust episode in Istanbul	25
Gauging the air quality of New York: a non-linear Nexus between COVID-19 and nitrogen dioxide emission	25
Do health expenditure and human development index matter in the carbon emission function for ensuring sustainable development? Evidence from the heterogeneous panel	25
Impacts of the COVID-19 lockdown on air quality and its association with human mortality trends in megapolis Mexico City	25
The impact of financial development on environmental quality: evidence from Malaysia	25
Predicting air quality of Dhaka and Sylhet divisions in Bangladesh: a time series modeling approach	25
Impact of COVID -19 pandemic lockdown on distribution of inorganic pollutants in selected cities of Nigeria	24
The nexus of environmental degradation and technology innovation and adoption: an experience from dragon	24
Air quality change during the COVID-19 pandemic lockdown over the Auvergne-Rhône-Alpes region, France	24
The impact of immigration on human capital and carbon dioxide emissions in the USA: an empirical investigation	23
Spatio-temporal analysis of urban air pollutants throughout China during 2014–2019	22
Regional differences of air pollution in China: comparison of clustering analysis and systematic clustering methods of panel data based on gray relational analysis	22
Exploring a deep LSTM neural network to forecast daily PM2.5 concentration using meteorological parameters in Kathmandu Valley, Nepal	22
Influence of lockdown caused by the COVID-19 pandemic on air pollution and carcinogenic content of particulate matter observed in Croatia	22
Prediction of the concentrations of PM1, PM2.5, PM4, and PM10 by using the hybrid dragonfly-SVM algorithm	21
Air pollution in Kenya: a review	21
PM2.5 chemical composition and geographical origin of air masses in Cape Town, South Africa	20
Predicting PM2.5 atmospheric air pollution using deep learning with meteorological data and ground-based observations and remote-sensing satellite big data	20
Pandemic products and volatile chemical emissions	20
Two decades of ozone standard exceedances in Santiago de Chile	19
Traffic characteristics and pollutant emission from road transport in urban area	19
Numerical study of thermal influence to pollutant dispersion in the idealized urban street road	19
Systematics of atmospheric environment monitoring in China via satellite remote sensing	18
A hybrid CNN-Transformer model for ozone concentration prediction	18
Analysis of PM10, Pb, Cd, and Ni atmospheric concentrations during domestic heating season in Sarajevo, Bosnia and Herzegovina, from 2010 to 2019	17
Source identification and health risk assessment associated with particulate- and gaseous-phase PAHs at residential sites in Delhi, India	17
Evaluation and scientometric analysis of researches on air pollution in developing countries from 1952 to 2018	17
Energy consumption, air pollution, and public health in China: based on the Two-Stage Dynamic Undesirable DEA model	17

Schoolchildren’s exposure to PM2.5: a student club–based air quality monitoring campaign using low-cost sensors	17
A review on recent trends of antiviral nanoparticles and airborne filters: special insight on COVID-19 virus	16
Car restriction policies for better urban health: a low emission zone in Madrid, Spain	16
Spatial-temporal prediction of ambient nitrogen dioxide and ozone levels over Italy using a Random Forest model for population exposure assessment	16
Isolating the impact of COVID-19 lockdown measures on urban air quality in Canada	16
The policy effects and influence mechanism of China’s carbon emissions trading scheme	16
The influence of COVID-19 preventive measures on the air quality in Abu Dhabi (United Arab Emirates)	16
A novel hybrid ensemble model for hourly PM2.5 forecasting using multiple neural networks: a case study in China	16
Ecological and human health risk assessment of heavy metals in dust affected by fireworks during the Spring Festival in Beijing	16
Comparison between AirQ+ and BenMAP-CE in estimating the health benefits of PM2.5 reduction	15
Odor nuisance and health risk assessment of VOC emissions from a rendering plant	15
An integrated assessment of the impacts of PM2.5 and black carbon particles on the air quality of a large Brazilian city	15
Contamination characteristics of heavy metals in particle size fractions from street dust from an industrial city, Central China	15
Effects of COVID-19 pandemic control measures on air pollution in Lima metropolitan area, Peru in South America	15
Comprehensive evaluation of urban air quality using the relative entropy theory and improved TOPSIS method	15
Coupling of quantile regression into boosted regression trees (BRT) technique in forecasting emission model of PM10 concentration	14
Reduction in concentration of PM2.5 in India’s top most polluted cities: with special reference to post-lockdown period	14
Air quality and photochemical reactions: analysis of NOx and NO2 concentrations in the urban area of Turin, Italy	14
Implementation of an aggregate index to elucidate the influence of atmospheric synoptic conditions on air quality in Athens, Greece	14
Source apportionment of rainwater chemical composition in wet precipitation at Kelaniya in Sri Lanka	14
Correlation between heavy metal concentration and oxidative potential of street dust	13
Modelling methane emissions from pig manure using statistical and machine learning methods	13
Spatio-temporal changes of PM10 trends in South Korea caused by East Asian atmospheric variability	13
Characteristics of indoor air pollutants and estimation of their exposure dose	13
Emission factors of selected air pollutants from rice straw burning in Hanoi, Vietnam	13
Pollution characteristics and human health risk from trace metals in roadside soil and road dust around major urban parks in Delhi city	13
Characteristics and health risk assessments of heavy metals in PM2.5 in Taiyuan and Yuci college town, China	13
Seasonal variation of oxidative potential of water-soluble components in PM2.5 and PM1 in the Yangtze River Delta, China	13
A review of different phytoremediation methods and critical factors for purification of common indoor air pollutants: an approach with sensitive analysis	12
Black carbon and size-segregated elemental carbon, organic carbon compositions in a megacity: a case study for Istanbul	12
Assessing and predicting air quality in northern Jordan during the lockdown due to the COVID-19 virus pandemic using artificial neural network	12
Spatial distribution of magnetic material in urban road dust classified by land use and type of road in San Luis Potosí, Mexico	12
Spatial heterogeneity of factors influencing transportation CO2 emissions in Chinese cities: based on geographically weighted regression model	12
Hybrid neural network models for forecasting ozone and particulate matter concentrations in the Republic of China	11
New insights into quantifying deposition and aerodynamic characteristics of PM2.5 removal by different tree leaves	11
Health risk assessment of exposure near-future PM2.5 in Northern Thailand	11
Spatial ensemble prediction of hourly PM2.5 concentrations around Beijing railway station in China	11
Characterisation of particulate matter and identification of emission sources in Greater Caracas, Venezuela	11
Effects of air pollution and climatology on COVID-19 mortality in Spain	11
Lag effect of ambient temperature on the cardiovascular disease hospital admission in Jiuquan, China	11
Air quality pollutants and their relationship with meteorological variables in four suburbs of Greater Sydney, Australia	11
Estimating ground-level PM2.5 over Bangkok Metropolitan Region in Thailand using aerosol optical depth retrieved by MODIS	11
Effect of socioeconomic status on the relationship between short-term exposure to PM2.5 and cardiorespiratory mortality and morbidity in a megacity: the case of Santiago de Chile	11
VOCs and PM concentrations in underground parking garages of the commercial center and high-rise residential buildings	11
Global evidence of time-frequency dependency of temperature and environmental quality from a wavelet coherence approach	11
Spatial and temporal distribution characteristics and influencing factors analysis of particulate matter pollution in Jinan City	11
Concentrations, health risks, and sources of hazardous air pollutants in Seoul-Incheon, a megacity area in Korea	11
Air-pollutant mass concentration changes during COVID-19 pandemic in Shanghai, China	11
Monitoring and analysis of the effects of atmospheric temperature and heat extreme of the environment on human health in Central Iran, located in southwest Asia	10
The impact of biogenic emissions on ozone formation in the Yangtze River Delta region based on MEGANv3.1	10
Emission inventory for harbour-related activities: comparison of two distinct bottom-up methodologies	10
A novel ensemble reinforcement learning gated unit model for daily PM2.5 forecasting	10
The fragranced products phenomenon: air quality and health, science and policy	10
Spatial variations in urban air pollution: impacts of diesel bus traffic and restaurant cooking at small scales	10
Recent advancements in low-cost portable sensors for urban and indoor air quality monitoring	10
Health risks of adults in Hong Kong related to inhalation of particle-bound heavy metal(loid)s	10
Investigation and analysis of climate comfort on people health tourism in Ardabil province, Iran	10
Indoor aerobic exercise reduces exposure to pollution, improves cognitive function, and enhances BDNF levels in the elderly	10
Concentrations, sources, and health risk associated with exposure to BTEX at ten sites located in an urban-industrial area in the Bajio Region, Mexico	10
Nitrogen dioxide decline and rebound observed by GOME-2 and TROPOMI during COVID-19 pandemic	10
Short-term effects of particulate matter on outpatient department visits for respiratory diseases among children in Bangkok Metropolitan Region: a case-crossover study	10
Receptor modelling and risk factors of polycyclic aromatic hydrocarbons (PAHs) in the atmospheric particulate matter at an IGP outflow location (island of the bay of Bengal—Bhola, Bangladesh)	10
Disparity in ozone trends under COVID-19 lockdown in a closely located coastal and hillocky metropolis of India	10
Evaluation of respiratory deposition doses in the presence of green infrastructure	10
An ensemble LSTM-based AQI forecasting model with decomposition-reconstruction technique via CEEMDAN and fuzzy entropy	10
Emission of aldehydes from different cooking processes: a review study	9
The impact of air pollution on urban residents’ health expenditure: spatial evidence from Yangtze River Delta, China	9
Estimating daily PM2.5 concentrations using an extreme gradient boosting model based on VIIRS aerosol products over southeastern Europe	9
Impacts of specific street geometry on airflow and traffic pollutant dispersion inside a street canyon	9
Measurement of size-fractionated atmospheric particulate matter and associated polycyclic aromatic hydrocarbons in Mumbai, India, and their dry deposition fluxes	9
Greenhouse gas emissions and cross-national happiness: a global perspective	9
Using crowd-sourced low-cost sensors in a land use regression of PM2.5 in 6 US cities	9
Do natural resources heal the environment? Empirical evidence from Turkey	9
Vertical profile of particulate matter: A review of techniques and methods	9
Seasonal impacts of buildings’ energy consumption on the variation and spatial distribution of air pollutant over Kabul City: application of Sentinel—5P TROPOMI products	9
Potential influential economic indicators and environmental quality: insights from the MERCOSUR economies	9
A multi-pollutant model: a method suitable for studying complex relationships in environmental epidemiology	9
Spatio-temporal patterns of climate parameter changes in Western Mediterranean basin of Türkiye and implications for urban planning	9
Health and economic losses attributable to PM2.5 and ozone exposure in Handan, China	9
Proof of concept to characterize historical heavy metal concentrations from annual rings of Corylus colurna: determining the changes of Pb, Cr, and Zn concentrations in atmosphere in 180 years in Nort	8

Variations of airborne bacterial community with seasons and environmental factors in Changsha, China	8
Long-term spatial and temporal variations of aerosol optical depth during 2000–2020 over Zambia, southcentral Africa	8
Indoor-outdoor pollutant concentration modelling: a comprehensive urban air quality and exposure assessment	8
Infant mortality rate and nonrenewable energy consumption in Asia and the Pacific: the mediating role of carbon emissions	8
Calibrating MERRA-2 PM2.5 concentrations with aerosol diagnostics: testing different machine learning approaches in the Eastern Mediterranean	8
Applicability of statistical and machine learning–based regression algorithms in modeling of carbon dioxide emission in experimental pig barns	8
Numerical simulation and experimental validation of the ventilation system performance in a heated room	8
Variations of particulate matter retention by foliage after wind and rain disturbance	8
Bushfire smoke plume composition and toxicological assessment from the 2019–2020 Australian Black Summer	8
Combined effects of different leaf traits on foliage dust-retention capacity and stability	8
Application of satellite data and GIS services for studying air pollutants in Lithuania (case study: Kaunas city)	8
Temporal variation of sulfate concentration in PM2.5 and major factors enhancing sulfate concentration in the atmosphere of Seoul, Korea	8
Pollution level and health risk assessment of heavy metals in ambient air and surface dust from Saudi Arabia: a systematic review and meta-analysis	8
Does environmental policy stringency influence CO2 emissions in the Asia Pacific region? A nonlinear perspective	8
Modeling energy and air pollution health damaging: a two-stage DEA approach	8
Influence of kitchen structures on household exposure to firewood-induced volatile organic compounds in Senwabarwana villages	8
Urban characteristics and its influence on resuspension of road dust, air quality and exposure	8
Risk assessment of occupational and public exposures to airborne particulate matter arising from a subway construction site in Tehran, Iran	8
A hybrid deep learning model with multi-source data for PM2.5 concentration forecast	8
Estimating ground-level PM2.5 using subset regression model and machine learning algorithms in Asian megacity, Dhaka, Bangladesh	8
Atmospheric mercury pollution: the current methodological framework outlined by environmental legislation	8
Effect of political stability on environmental quality: long-run and asymmetric evidence from Iceland by non-linear approaches	8
Dynamic common correlated effects of pandemic uncertainty on environmental quality: fresh insights from East-Asia and Pacific countries	7
High-resolution inventory of emissions of atmospheric PM10 from agricultural tillage and harvesting operations in China: historical trend, spatio-temporality, and optimization methodology	7
Mercury distribution and emission reduction potentials of Chinese coal-fired industrial boilers	7
Estimation of high-resolution PM2.5 concentrations based on gap-filling aerosol optical depth using gradient boosting model	7
Effects of air pollution on daily hospital admissions for cardiovascular diseases in Castilla-La Mancha, Spain: a region with moderate air quality	7
Impact of emissions from a single urban source on air quality estimated from mobile observation and WRF-STILT model simulations	7
Polycyclic aromatic hydrocarbons in atmospheric particulate matter (PM10) at a Southwestern Europe coastal city: status, sources and health risk assessment	7
The impact of emissions and climate change on future ozone concentrations in the USA	7
Emissions and health risk assessment of process-based volatile organic compounds of a representative petrochemical enterprise in East China	7
Source apportionment and health effects of particle-bound metals in PM2.5 near a precision metal machining factory	7
Exposure measurement error in air pollution studies: the impact of shared, multiplicative measurement error on epidemiological health risk estimates	7
Variation in the concentrations of atmospheric PM2.5 and its main chemical components in an eastern China city (Hangzhou) since the release of the Air Pollution Prevention and Control Action Plan in 2	7
Formation and driving factors of sulfate in PM2.5 at a high-level atmospheric SO2 city of Yangquan in China	7
Spatiotemporal variations and pollution sources of HCHO over Jiangsu-Zhejiang-Shanghai based on OMI	7
Health depreciation effect and medical cost effect of air pollution: based on multidimensional health perspective	7
Determination of the indoor radon concentration in schools of Tenerife (Canary Islands): a comparative study	7
Radon exposure assessment and its decay products aerosols in some houses of the province of El Jadida, Morocco	7
Spatially differentiating the effects of long-term air pollution on specific causes of death from cardiovascular and respiratory mortality in Hong Kong: a territory-wide register-based study	7
The short-term effects of air pollutants on pneumonia hospital admissions in Lanzhou, China, 2014–2019: evidence of ecological time-series study	7
PM10, PM2.5, PM1, and PM0.1 resuspension due to human walking	7
Substantial changes of chemical composition and sources of fine particles during the period of COVID-19 pandemic in Taiyuan, Northern China	7
Volatile chemical emissions from essential oils with therapeutic claims	7
A bibliometric and scientometric: analysis towards global pattern and trends related to aerosol and precipitation studies from 2002 to 2022	7
Application of exogenous indole-3-acetic acid on shoots of Zamioculcas zamiifolia for enhancing toluene and formaldehyde removal	7
Potted plants can remove the pollutant nitrogen dioxide indoors	7
Spatiotemporal variations and sources of PM2.5 in the Central Plains Urban Agglomeration, China	7
A systematic review on mitigation of common indoor air pollutants using plant-based methods: a phytoremediation approach	7
The economic burden of mortality and morbidity due to air pollution in Tehran, Iran: a systematic review	7
Source identification of fine and coarse aerosol during smog episodes in Debrecen, Hungary	7
Estimated effects of meteorological factors and fire hotspots on ambient particulate matter in the northern region of Thailand	6
Volatile chemical emissions from car air fresheners	6
Exploring the interrelationship among health status, CO2 emissions, and energy use in the top 20 highest emitting economies: based on the CS-DL and CS-ARDL approaches	6
Analysis of air pollutants in Kagithane valley and Istanbul Metropolitan Area	6
Association of short-term exposure to air pollution with mortality in a middle eastern tourist city	6
Evaluation of the annual economic costs associated with PM2.5-based health damage—a case study in Ho Chi Minh City, Vietnam	6
Atmospheric levels, multivariate statistical study, and health risk assessment of odorous compounds (H2S and NH3) in areas near polluted urban rivers in the city of Salvador, in Northeastern Brazil	6
Associations between species-level indoor microbiome, environmental characteristics, and asthma in junior high schools of Terengganu, Malaysia	6
The ground-level ozone concentration is inversely correlated with the number of COVID-19 cases in Warsaw, Poland	6
Radon levels and indoor air quality after application of thermal retrofit measures—a case study	6
Spatiotemporal characteristics and influencing factors of Air pollutants over port cities of the Yangtze River Delta	6
Mutation test and multiple-wavelet coherence of PM2.5 concentration in Guiyang, China	6
Environmental impact estimation of PM2.5 in representative regions of China from 2015 to 2019: policy validity, disaster threat, health risk, and economic loss	6
Biochemical and molecular effects of naringenin on the cardiovascular oxidative and pro-inflammatory effects of oral exposure to diesel exhaust particles in rats	6
Impact on ground-level ozone formation by emission characterization of volatile organic compounds from a flex-fuel light-duty vehicle fleet in a traffic tunnel in Rio de Janeiro, Brazil	6
Seasonal abundances of primary and secondary carbonaceous aerosols at a high-altitude station in the Western Ghat Mountains, India	6
Insight into the environmental monitoring and source apportionment of volatile organic compounds (VOCs) in various functional areas	6
Increasing risk of gestational diabetes and preeclampsia associated with long-term exposure effects of air pollution	6
Sex differences in associations of fine particulate matter with non-accidental deaths: an ecological time-series study	6
Investigation of sources and processes influencing variation of PM2.5 and its chemical compositions during a summer period of 2020 in an urban area of Hanoi city, Vietnam	6
Dust particles transport during the rare strong sandstorm process in Northern China in early year 2021	6
An estimation of shipping emissions to analysing air pollution density in the Izmir Bay	6
Daytime concentrations of minor and trace elements in atmospheric aerosols at four sampling sites of Dar es Salaam, Tanzania	6
Difference on oxidative stress in lung epithelial cells and macrophages induced by ambient fine particulate matter (PM2.5)	6
Review of land use specific source contributions in PM2.5 concentration in urban areas in India	6
An integrated approach for analyzing air quality monitoring data: a case study in Hanoi, Vietnam	6
Radon measurements in water galleries in Tenerife, Canary Islands (Spain)	6
Spatial and temporal variation characteristics of atmospheric NO2 and SO2 in the Beijing-Tianjin-Hebei region before and after the COVID-19 outbreak	6
Particulate matter generation in daily activities and removal effect by ventilation methods in residential building	6
Exposure to volatile organic compounds (VOCs) at gas stations: a probabilistic analysis	6
Effect of COVID-19 on transportation air pollution by moderation and mediation analysis in Queens, New York	5
Fluctuations in nighttime ground-level ozone concentrations during haze events in Malaysia	5
Assessing the contribution of different sources in atmospheric dispersion of PM2.5 and related health impact in a region of Qazvin, Iran	5
Inter- and intra-city comparisons of PM2.5 concentration changes under COVID-19 social distancing in seven major cities of South Korea	5
Exposure to air pollutants among cyclists: a comparison of different cycling routes in Perth, Western Australia	5
Air quality and preventable deaths in Tekirdağ, Turkey	5
Analysis of the impact of multiscale green landscape on urban PM2.5	5
Simulation of atmospheric mercury dispersion and deposition in Tehran city	5
Association of VOCs, PM2.5 and household environmental exposure with children’s respiratory allergies	5
Network analysis: a novel approach to identify PM2.5 hotspots and their spatio-temporal impact on air quality in Santiago de Chile	5
Evidence for reduced performance discrepancy of improved cookstoves at laboratory and field	5
Chemical characterization, source apportionment, and human health risk assessment of PM2.5 in an urban area in Hanoi, Vietnam	5
Personal PM2.5 exposures of husband and wife by residential characteristics in Ulaanbaatar, Mongolia	5
Corruption and air pollution: a comparative study of African and OECD countries	5