A direct analysis of how air pollution and variations in microclimates affect historically marginalized communities in Nashville, Tennessee

Keywords: Air quality, pollution, redlining, urbanization, microclimates.
Abstract Type: Poster Abstract

Abstract

Redlining, a discriminatory practice of withholding financial investments, including mortgages, healthcare, and credit, in primarily Black neighborhoods, led to urban decay in inner cities. While this practice was outlawed in the 1960s, the effects of these policies are still experienced. For example, a heat mapping study in Nashville indicates that historically redlined areas are warmer than other areas of the city. To better understand environmental inequalities and their impact, especially in urban areas where historical and socioeconomic factors shape environmental conditions, we investigated the differences in air quality and microclimates across six neighborhoods that are classified as redlined, gentrified, and invested. Twice each month from September 2024 to February 2025, we collected wind speed and direction, temperature, and relative humidity using a Kestrel Weather Meter and heat signatures using a thermal camera in each neighborhood. At each sampling location, we also collected carbon dioxide, HCHO (formaldehyde), and 2.5µm and 10µm size particulate matter using a handheld air quality monitor and collected ambient air in 6-liter canisters. The ambient air was analyzed using Gas Chromatography - Mass Spectrometry (GC-MS) to provide valuable data on specific pollutants in these areas and allow us to quantify the concentration of pollutants. This study aims to provide valuable insights into how air quality and microclimates differ in historically redlined, gentrified, and invested neighborhoods to highlight environmental injustices. Findings will inform future policy adjustments and support current community-based solutions to ensure equitable neighborhood environments throughout Nashville, Tennessee.