Trade Policy in the Air: How Tariffs Can Interact With U.S. Air Quality

by | Sep 4, 2026

Tariffs are usually discussed in terms of prices, manufacturing, jobs, and international trade.

They can also interact with air quality.

A tariff is essentially a tax placed on imported goods. By changing the cost of products and components entering the United States, tariffs can influence where goods are manufactured, which technologies companies purchase, and how quickly certain industries expand.

None of this means that a tariff automatically makes air cleaner or dirtier.

Instead, trade policy can affect air quality indirectly through several identifiable pathways. Three particularly important examples involve renewable electricity, vehicle electrification, and the location of industrial manufacturing.

Tariffs Can Affect the Cost of Cleaner Electricity

Solar power illustrates one of the clearest connections.

The United States has imposed several forms of trade restrictions on imported solar equipment during the past decade. Current Section 301 measures include substantial tariffs on solar cells and other solar-manufacturing products from China.

The purpose of these policies is largely economic and strategic: protect or expand domestic manufacturing and reduce dependence on overseas supply chains.

From an air-quality perspective, however, the important question is what happens to the cost and speed of new electricity projects.

Solar panels themselves produce electricity without emitting sulfur dioxide, nitrogen oxides, mercury, or particulate matter during operation.

Coal- and natural-gas-fired power plants, by comparison, produce combustion emissions. Nitrogen oxides contribute to ozone and fine-particle formation, while sulfur dioxide from coal combustion contributes to particulate pollution.

If tariffs raise the cost of imported solar panels, cells, batteries, steel, or other project components, they can change the economics of new renewable-energy installations.

The Department of Energy reported in its 2026 U.S. Energy and Employment Report that tariffs increased costs for several important solar inputs and were among factors affecting project economics and delaying planned capacity.

That does not mean every delayed solar project results in a corresponding increase in pollution. Electricity markets are much more complicated than that.

It does mean trade policy can interact with air quality by influencing how quickly zero-emission generating capacity is added to the electrical grid.

Batteries and Electric Vehicles Create a Transportation Connection

Transportation provides another link.

The United States maintains significant tariffs on several clean-technology products imported from China. Section 301 measures include a 100 percent tariff on Chinese electric vehicles and tariffs on lithium-ion batteries and battery components.

The purpose of these measures is again primarily industrial policy rather than air-quality regulation.

But the products involved have direct relevance to urban air pollution.

Gasoline and diesel vehicles produce nitrogen oxides, carbon monoxide, volatile organic compounds, particulate matter, and other pollutants through their exhaust systems.

Fully electric vehicles do not produce tailpipe emissions.

They are not emission-free in an absolute sense. Electricity generation can produce pollution depending on the source of power, while tires and brakes continue producing particulate matter.

Still, replacing combustion vehicles with electric vehicles removes a pollution source directly from roads and neighborhoods.

Tariffs can interact with that transition by affecting the price, availability, and origin of vehicles, batteries, and critical components.

The environmental outcome is not straightforward.

A tariff that makes one imported EV more expensive could reduce access to that particular vehicle. At the same time, a tariff intended to encourage domestic battery or vehicle manufacturing could eventually expand another source of electric vehicles.

Air-quality effects therefore depend on how manufacturers and consumers actually respond rather than on the tariff rate alone.

Tariffs Can Change Where Pollution Occurs

The third connection is broader and sometimes overlooked.

Manufacturing creates pollution where factories are located.

Producing steel, cement, chemicals, electronics, machinery, and other goods requires energy and industrial processes that may emit sulfur dioxide, nitrogen oxides, particulate matter, volatile organic compounds, and other pollutants.

International trade effectively separates where a product is consumed from where its manufacturing emissions occur.

Research examining U.S.-China trade has demonstrated this clearly.

Historically, transferring manufacturing from the United States to China reduced some production-related emissions within the United States. At the same time, part of the pollution produced in Asia was transported across the Pacific atmosphere and measurably influenced air quality in the western United States.

Researchers estimated that Chinese emissions associated with exports contributed to sulfate and ozone concentrations over portions of the United States.

Tariffs matter because they can change these trade patterns.

If tariffs encourage production to move from one country to another, the associated industrial emissions may move as well.

That does not automatically mean reshoring manufacturing worsens U.S. air quality.

American factories operate under U.S. environmental regulations, and modern domestic facilities may produce substantially fewer pollutants per unit of output than older or less-controlled facilities elsewhere.

The important point is that trade policy can redistribute the geographic location of emissions rather than simply eliminating them.

Air Pollution Does Not Respect Trade Borders

International air pollution adds another complication.

Goods can cross borders in shipping containers, but air pollution crosses borders without customs inspections.

Particulate precursors, wildfire smoke, ozone-related compounds, and other pollutants can travel hundreds or thousands of miles through the atmosphere.

This means moving pollution-intensive manufacturing overseas does not completely isolate American communities from its environmental consequences.

Likewise, bringing production back to the United States places emissions closer to American populations but also places those facilities under domestic monitoring, permitting, and pollution-control requirements.

Determining which outcome is cleaner requires examining the specific industry, energy source, manufacturing technology, and location.

Tariffs Are Not Air-Quality Regulations

Tariffs are economic instruments.

They are normally designed to address trade practices, national security, domestic manufacturing, supply chains, or competition—not concentrations of PM2.5 or ozone.

Their interaction with air quality occurs because modern economies depend on energy, transportation, and manufacturing.

A tariff on a solar cell can influence the cost of electricity infrastructure.

A tariff on a battery can influence transportation technology.

A tariff on manufactured goods can influence where the pollution associated with making those goods occurs.

Those relationships are real, but they are not simple enough to conclude that tariffs as a category either improve or damage air quality.

For air-quality analysis, the better question is always more specific:

What product is being taxed, what activity changes because of that tariff, and where do the resulting emissions occur?

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