Disparities in a common air pollutant are visible from space

Date:
August 5, 2020
Source:
American Chemical Society
Summary:
As a global center for petrochemical manufacturing, Houston, Texas,
experiences some of the worst air quality in the country, according
to the U.S. Environmental Protection Agency. Evidence suggests that
air pollution disproportionately affects low-income, non-white
and Hispanic residents, but it's difficult to directly observe
differences in pollutants between neighborhoods. Now, researchers
have used airplanes and a satellite to uncover disparities in
nitrogen dioxide amounts in the atmosphere above Houston.



FULL STORY ==========================================================================
As a global center for petrochemical manufacturing, Houston, Texas,
experiences some of the worst air quality in the country, according to
the U.S.

Environmental Protection Agency. Evidence suggests that air pollution disproportionately affects low-income, non-white and Hispanic residents,
but it's difficult to directly observe differences in pollutants between neighborhoods. Now, researchers reporting in Environmental Science &
Technology have used airplanes and a satellite to uncover disparities
in nitrogen dioxide amounts in the atmosphere above Houston.


========================================================================== Nitrogen dioxide, a precursor to ground-level ozone and particulate
matter, is produced mainly by vehicles and power plants. In Houston, petrochemical refineries and industrial activities also emit this
pollutant, which has been linked to respiratory problems. Ground-based
nitrogen dioxide monitors and low- resolution satellite observations
have historically had limited abilities to capture differences among neighborhoods of the same city. Angelique Demetillo, Sally Pusede and colleagues wanted to use a new high-spatial-resolution dataset from a
NASA spectrometer onboard an airplane to investigate neighborhood-level differences in nitrogen dioxide within Houston, and to see whether
these differences correlated with race-ethnicity and income of the neighborhoods.

They also wanted to use these airborne data to evaluate whether the
recently launched, space-based TROPOspheric Monitoring Instrument
(TROPOMI) could resolve similar between-neighborhood differences.

The researchers used the NASA airborne spectrometer data to examine
differences in population-weighted nitrogen dioxide levels for different
census tracts. The areas where the pollutant was highest were where more low-income, non-white and Hispanic people lived. In contrast, where
the pollutant was lowest, high- income, white people tended to live
there. Most of the disparities could be explained by proximity of the neighborhoods to industrial sources and heavy- duty diesel vehicles. The researchers then used the observations from TROPOMI in a similar analysis, demonstrating that these new space-based measurements could also detect pollution inequalities within Houston. While the aircraft measurements
can be collected over one-month periods, the TROPOMI observations are
made almost daily and have the potential to be useful to decision-makers
as they allocate resources for reducing air pollution, propose emission requirements and invest in public transportation, the researchers say.


========================================================================== Story Source: Materials provided by American_Chemical_Society. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Mary Angelique G. Demetillo, Aracely Navarro, Katherine K. Knowles,
Kimberly P. Fields, Jeffrey A. Geddes, Caroline R. Nowlan,
Scott J. Janz, Laura M. Judd, Jassim Al-Saadi, Kang Sun, Brian
C. McDonald, Glenn S.

Diskin, Sally E. Pusede. Observing Nitrogen Dioxide Air Pollution
Inequality Using High-Spatial-Resolution Remote Sensing Measurements
in Houston, Texas. Environmental Science & Technology, 2020; DOI:
10.1021/ acs.est.0c01864 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200805091658.htm

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