Air Purifiers Fail India's Smog Test

Air purifiers are a common household purchase in North India during winter smog season, but their effectiveness is often limited. Research indicates that while HEPA filters work, practical issues like indoor cooking, undersized units, and poor guidance reduce their impact significantly. Indoor PM2.5 levels can exceed guidelines even in homes with purifiers, especially during cooking hours.

Furthermore, access to clean air is disproportionately available to wealthier households. Studies suggest that the cost of purchasing, powering, and maintaining effective air purification systems is beyond the budget of many families most affected by pollution. This creates a situation where health protection becomes a privilege tied to income.

Solutions proposed include treating filtered air as a public health service, similar to vaccines, and supplying purifiers to high-risk individuals through subsidies. Public institutions like schools and health centers could also be equipped with filtration systems. Additionally, market regulations requiring clear performance labeling and guidance on integrated ventilation are needed. Ultimately, source control of emissions remains paramount.