Particulate pollution has important consequences for human health, and is an issue of global concern. Outdoor air pollution has become a cause for alarm in India in particular because recent data suggest that ambient pollution levels in Indian cities are some of the highest in the world. We study the number of particles between 0.5μm and 2.5μm indoors while using affordable air purifiers in the highly polluted city of Delhi. Though substantial reductions in indoor number concentrations are observed during air purifier use, indoor air quality while using an air purifier is frequently worse than in cities with moderate pollution, and often worse than levels observed even in polluted cities. When outdoor pollution levels are higher, on average, indoor pollution levels while using an air purifier are also higher. Moreover, the ratio of indoor air quality during air purifier use to two comparison measures of air quality without an air purifier are also positively correlated with outdoor pollution levels, suggesting that as ambient air quality worsens there are diminishing returns to improvements in indoor air quality during air purifier use. The findings of this study indicate that although the most affordable air purifiers currently available are associated with significant improvements in the indoor environment, they are not a replacement for public action in regions like Delhi. Although private solutions may serve as a stopgap, reducing ambient air pollution must be a public health and policy priority in any region where air pollution is as high as Delhi’s during the winter.
Solid fuel use is an important contributor to air pollution and disease burden in India. We present survey evidence documenting LPG ownership and cooking fuel use in rural north India. LPG ownership has increased rapidly, substantially driven by the Ujjwala Yojana. Three-quarters of rural households in Bihar, Madhya Pradesh, Rajasthan, and Uttar Pradesh now have LPG. Almost all of these households also have a stove that uses solid fuels, and among those owning both, almost three-quarters used solid fuels the day before the survey. Household economic status, relative costs of cooking fuels, gender inequality, and beliefs regarding the ease, food taste, and health impacts of cooking with solid fuels versus LPG are important contributors to high solid fuel use despite LPG ownership. Households that continue to use solid fuels continue to expose themselves and their neighbours to harmful air pollution. To realize the full health benefits of Ujjwala’s expansion in LPG ownership, attention must now be turned towards discouraging the use of solid fuels and promoting exclusive use of LPG. This is an urgent priority for research, policy, and action.
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