Chemical Engineering July 2023 - 4

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Protecting the air we breathe
I
t has long been known, from advanced monitoring and modeling,
that pollutants can linger in the air and travel long distances from
their sources. Local air quality can therefore be affected by disturbances
that happen in far-away parts of the globe. The atmosphere
connects us, worldwide, making air quality a global concern.
Recently, the ability for polluted air to travel far with dramatic
consequences was witnessed by many in North America. Wildfires
covering an area reported to be over 10 million acres in Canada
produced a heavily air-pollutant-laden plume that covered many
areas of the United States with a dark, orange, eerie haze that was
deemed unhealthy and even toxic by some reports. Areas stretching
from Minnesota and Wisconsin to Maryland and New England
had all been issued poor air quality alerts at some point during the
plume's movement.
Measuring the air quality
Many people, who were perhaps not yet familiar with it, learned about
the Air Quality Index (AQI) - the U.S. Environmental Protection Agency's
(EPA) measure of air quality. The EPA establishes an AQI for five
major pollutants - ozone, particulate matter, carbon monoxide, sulfur
dioxide and nitrogen dioxide. The one of major concern from the
wildfires was particulate matter less than 2.5 microns in size (PM2.5).
These fine particles are able to travel deep into the respiratory tract
and are associated with numerous adverse health effects. The AQI
runs from 0 to 500, with higher values indicating a higher level of
pollution and greater concern for potential health issues. An AQI up
to 50 is regarded as healthy, over 100 is unhealthy, over 200 is very
unhealthy and over 300 is considered hazardous.
At one point last month, the AQI in New York City was reported to
be over 400. Residents were advised to stay indoors and wear masks
if going outside was essential. At the time of this writing, the wildfires
are still raging and many are keeping track of their local AQIs as wind
patterns shift.
These recent events and many others, whether from wildfires or
other sources of air-pollution plumes, are a stark reminder of how
important our air quality is.
The CPI is doing its part
With goals related to sustainability and combating climate change [1],
the chemical process industries (CPI) are working toward reducing
industrial air-pollution emissions. The American Chemistry Council
(ACC; www.americanchemistry.com) reports that its member companies
are investing in and deploying technologies to lower emissions.
According to the ACC, its member Responsible Care facilities have
reduced hazardous air pollutant emissions by approximately 24%
from 2010 to 2020.
Our two cover stories this month focus on reducing air pollution
from industrial sources. The first article (pp. 25-27) offers considerations
in choosing between combustion and noncombustion
air-pollution-abatement technologies.
And the second article (pp. 28-30) discusses a
proactive approach to reducing emissions.
■
Dorothy Lozowski, Editorial Director
1. According to the U.S. Geological Survey (USGS; www.usgs.
gov),there is no direct relationship between climate change and
wildfires, but they say there is a general consensus that fire instances
will increase with climate change.
4
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Chemical Engineering July 2023

Table of Contents for the Digital Edition of Chemical Engineering July 2023
