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October 16, 2022

Urban air pollution contributes to health risks, especially in low-income neighborhoods. In response, some churches in St. Louis are installing air quality sensors on their property. The churches, working with groups like AirWatch St. Louis and St. Louis’s Washington University, are sharing data in an effort to produce a better-informed advocacy and ultimately motivate legislative change.

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Why is air pollution often worse in poorer neighborhoods? There are various reasons.

It is tempting to attribute the problem to moral failures like dehumanization and discrimination. But ordinary economic incentives also play a role, and we ignore them at our peril.

Non-discriminatory Reasons for Poor-area Pollution Problems

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To keep their costs low, businesses naturally look to locate their factories, which cover large plots of land, in areas where land is cheap. Once they have done so, the adverse side effects of industrial sites — like unsightly buildings and equipment, noise, rail and truck traffic, odors, and the risk of hazardous emissions — tend to keep the property values low in the immediate area.

Housing in the vicinity consequently tends to be less expensive, attracting lower-income residents and contributing to a clustering effect: pollution-prone industries and low-cost housing in a mutually reinforcing, if uneasy, proximity.

The geography of employment is relevant here, too. If the industry needs large numbers of lower-skilled workers, those employees understandably will want to live near their places of employment, leading to the “mill town” phenomenon that developed in the early years of the Industrial Revolution.

Not surprisingly, pollution-related health problems are likely to be more common in such neighborhoods, and not only because of emissions from nearby factories. Housing in low-income areas is less likely to have been refurbished to remove lead paint or asbestos, and it may be nearer busy highways or other sources of vehicle emissions.

You might naturally think, “Well, then why not improve the housing — remove the lead paint and asbestos, install doors and windows that better block out traffic noise, and improve indoor air quality?” That of course can be done, but the costs will be passed on to the residents — making the housing too expensive for those most in need of affordable housing. Then, rising property values may cause industries to relocate, leaving the locals unemployed, or vacant housing may lead owners to allow housing to deteriorate, or both, exacerbating the original problems and adding new ones.

The Importance of Institutions