Indoor PM and CO concentrations in rural Guizhou, China

Abstract Household air pollution (HAP) from use of solid fuels varies greatly depending on stove technology, fuel, housing characteristics, season, and geographical area. Accurate information about indoor air pollution concentration as well as personal exposure is vital for more precise estimates of the health burden from HAP. We measured indoor fine particles ≤ 2.5 μm in aerodynamic diameter (PM 2.5 ) and carbon monoxide (CO) concentrations for 48 h in 179 homes in winter and 122 homes in summer in rural Guizhou, China. Furthermore, we measured personal CO exposure among 1796 women. The highest median [25th–75th percentiles] PM 2.5 kitchen concentrations were found in winter in biomass homes with an open fire (557 [303–882] μg/m 3 ) or a stove without chimney (533 [210–770] μg/m 3 ), while homes with a chimney stove had lower median kitchen concentrations (337 [212–1114] μg/m 3 and 371 [192–1208] μg/m 3 for biomass and coal, respectively). There was large seasonal variability with lower concentrations in summer for both PM 2.5 and CO. Indoor CO concentrations were more correlated with type of fuel than stove technology, with higher median winter concentrations in kitchens using biomass (2.4 [0.9–4.6] ppm) than coal (0.7 [0.6–1.5] ppm). Personal CO exposure was relatively low, with median 1.3 [0.9–2.1] ppm. Stove and fuel type, ventilation, kitchen configuration, occupation, secondhand tobacco smoke, time spent outdoors, and ambient temperature were all associated with personal CO exposure. We found that CO could not be used as a suitable proxy for PM 2.5 in this setting due to large heterogeneity in stove and fuel use within homes. We also found only a weak correlation between personal and indoor measurements, highlighting the importance of doing personal measurements in epidemiological research. Most households exceeded the PM 10 Chinese indoor air pollution standard of 150 μg/m 3 . Hence, continued efforts are needed to mitigate health damaging levels of HAP.

[1]  K. R. Smith,et al.  Carbon monoxide as a tracer for assessing exposures to particulate matter in wood and gas cookstove households of highland Guatemala. , 2001, Environmental science & technology.

[2]  Alan D. Lopez,et al.  A comparative risk assessment of burden of disease and injury attributable to 67 risk factors and risk factor clusters in 21 regions, 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010 , 2012, The Lancet.

[3]  Nigel Bruce,et al.  Personal child and mother carbon monoxide exposures and kitchen levels: Methods and results from a randomized trial of woodfired chimney cookstoves in Guatemala (RESPIRE) , 2010, Journal of Exposure Science and Environmental Epidemiology.

[4]  Who Regional Office for Europe,et al.  WHO Guidelines for Indoor Air Quality: Selected Pollutants , 2011 .

[5]  Sumi Mehta,et al.  Exposure assessment for respirable particulates associated with household fuel use in rural districts of Andhra Pradesh, India , 2004, Journal of Exposure Analysis and Environmental Epidemiology.

[6]  Eduardo Canuz,et al.  An inexpensive light-scattering particle monitor: field validation. , 2007, Journal of environmental monitoring : JEM.

[7]  A. Mellouki,et al.  Chemical and size characterization of particles emitted from the burning of coal and wood in rural households in Guizhou, China , 2012 .

[8]  Who Europe.  Air Quality Guidelines Global Update 2005: Particulate Matter, ozone, nitrogen dioxide and sulfur dioxide , 2006 .

[9]  Eduardo Canuz,et al.  Temperature dataloggers as stove use monitors (SUMs): Field methods and signal analysis. , 2012, Biomass & bioenergy.

[10]  K. R. Smith,et al.  Household CO and PM measured as part of a review of China's National Improved Stove Program. , 2007, Indoor air.

[11]  Stephen J Reynolds,et al.  Indoor air pollution, cookstove quality, and housing characteristics in two Honduran communities. , 2010, Environmental research.

[12]  Rufus Edwards,et al.  Impact of improved cookstoves on indoor air quality in the Bundelkhand region in India , 2007 .

[13]  D. Kammen,et al.  The contributions of emissions and spatial microenvironments to exposure to indoor air pollution from biomass combustion in Kenya. , 2000, Environmental health perspectives.

[14]  K. Balakrishnan,et al.  Geographical, spatial, and temporal distributions of multiple indoor air pollutants in four Chinese provinces. , 2005, Environmental science & technology.

[15]  Omar Masera,et al.  Reduction in personal exposures to particulate matter and carbon monoxide as a result of the installation of a Patsari improved cook stove in Michoacan Mexico. , 2008, Indoor air.

[16]  K. Balakrishnan,et al.  Patterns of household concentrations of multiple indoor air pollutants in China. , 2005, Environmental science & technology.

[17]  C. Koshland,et al.  Daily and peak 1 h indoor air pollution and driving factors in a rural Chinese village. , 2007, Environmental science & technology.

[18]  Ken R. Smith,et al.  Impact of improved biomass cookstoves on indoor air quality near Pune, India , 2007 .

[19]  N. Bruce,et al.  Longitudinal Relationship between Personal CO and Personal PM2.5 among Women Cooking with Woodfired Cookstoves in Guatemala , 2013, PloS one.

[20]  L. Pritchett,et al.  Estimating Wealth Effects Without Expenditure Data—Or Tears: An Application To Educational Enrollments In States Of India* , 2001, Demography.

[21]  Daniel M. Kammen,et al.  Comparison of Emissions and Residential Exposure from Traditional and Improved Cookstoves in Kenya , 2000 .

[22]  Amanda Northcross,et al.  Estimating personal PM2.5 exposures using CO measurements in Guatemalan households cooking with wood fuel. , 2010, Journal of environmental monitoring : JEM.

[23]  中華人民共和国国家統計局.  China statistical yearbook , 1988 .

[24]  M. Ezzati,et al.  Patterns and predictors of personal exposure to indoor air pollution from biomass combustion among women and children in rural China. , 2011, Indoor air.

[25]  Bhaswati Ganguli,et al.  State and national household concentrations of PM2.5 from solid cookfuel use: Results from measurements and modeling in India for estimation of the global burden of disease , 2013, Environmental Health.

[26]  F. Dominici,et al.  Household concentrations and exposure of children to particulate matter from biomass fuels in The Gambia. , 2012, Environmental science & technology.