Edmund Muskie and the Clean Air Act of 1970

Rumford, Maine, sits on a bend of the Androscoggin River, and for most of the twentieth century the thing you noticed first about Rumford was the smell. The paper mill there cooked wood chips into pulp, and the river below it carried the leftovers downstream. Edmund Sixtus Muskie was born in that town in 1914, the son of a Polish immigrant tailor. He grew up, went to Bates College and Cornell Law, served in the Navy, became governor of Maine and then, in 1959, a United States senator. In Washington he asked for a seat on the Public Works Committee, which most ambitious senators treated as a place to hand out dams and post offices. Muskie used it to build something nobody had built before: a subcommittee whose whole job was air and water pollution. The river he grew up beside would turn out to be the most important briefing paper he ever read.

In short: The Clean Air Act of 1970 came out of a Senate subcommittee Edmund Muskie chaired, passed both chambers with almost no opposition, and was signed by Richard Nixon on the last day of 1970. Its central idea, that air standards are set to protect health rather than to fit what industry finds affordable, has survived half a century of attacks and is still the reason the air over most American cities is cleaner than it was. The fight now is over who still breathes the worst of what is left.

A subcommittee nobody wanted

The Senate Subcommittee on Air and Water Pollution was created in 1963, and Muskie became its first chairman. That was not a glamorous assignment. Pollution, in the early 1960s, was mostly treated as a local nuisance, a matter for city smoke inspectors and county health boards. Federal law on air had been thin: a 1955 act paid for research, and a 1963 Clean Air Act offered grants and a slow conference process for interstate pollution. Then came the Air Quality Act of 1967, which asked states to set their own standards region by region. Very few did so in a way that made a difference.

Muskie spent those years doing the unshowy work that makes later laws possible. He held hearings around the country. He learned the chemistry well enough to argue with automobile executives. He built a staff that understood both engineering and Senate procedure, and he kept the subcommittee bipartisan in temper even when it was not in membership. When the moment came, he had the expertise in one room.

The moment came fast. By 1969 and 1970 the public mood had swung hard. The Cuyahoga River had caught fire in Cleveland again in 1969. Oil from a blowout off Santa Barbara had coated California beaches early in 1969. On April 22, 1970, millions of Americans turned out for the first Earth Day. Air pollution was no longer a nuisance in the minds of voters; it was something their children were breathing.

Nixon, Muskie and a race to the strongest bill

Here is the strange true detail that explains the shape of the law. Richard Nixon expected Edmund Muskie to be his opponent in the 1972 presidential election. Muskie had been Hubert Humphrey's running mate in 1968 and was widely seen as the Democratic front-runner. Nixon, who was not personally passionate about the environment, understood that he could not let Muskie own the issue.

So in early 1970 the White House sent Congress its own air pollution proposal. The House passed a version in June 1970 by a lopsided margin, with only one member voting no. That left the Senate, and Muskie, as the last stop.

Muskie had a problem of his own. A study group organized by Ralph Nader published a report that year accusing Congress, and Muskie by name, of being too soft on polluters. For a senator planning to run for president as the clean-air candidate, that stung. The combination of a rival in the White House and critics on his left pushed Muskie toward a much tougher bill than anything the administration had sent.

The Senate version did three things that were new. It told the federal government to set national air quality standards for the most common pollutants and to set them on the basis of health. It ordered car makers to cut certain tailpipe emissions by about 90 percent within a few model years, a target the industry said it could not meet. And it let ordinary citizens go to court to force polluters, and the government itself, to follow the law. The Senate passed that bill in September 1970 without a single vote against it.

A conference committee blended the two versions, mostly in the Senate's direction. Nixon signed the Clean Air Act Amendments of 1970 on December 31. A few weeks earlier, by executive reorganization, he had also created the Environmental Protection Agency, which opened its doors in early December 1970 and would be the agency charged with carrying the new law out.

The idea at the centre: health first

The section of the 1970 law that has mattered most is short. It directs the EPA to set National Ambient Air Quality Standards for widespread pollutants at a level "requisite to protect the public health" with an adequate margin of safety. The standards cover what are now called the criteria pollutants: ozone, fine and coarse particles, carbon monoxide, sulfur dioxide, nitrogen dioxide and lead.

Notice what is missing from that instruction. It does not tell the agency to weigh the cost of meeting the standard. The question the scientists are supposed to answer is how clean the air must be for people, including vulnerable people such as children and people with asthma, to be safe. How to get there, and how fast, comes afterwards, through state plans, technology rules and deadlines.

Industry groups argued for decades that this was irrational, that no sensible government sets a goal without asking what it costs. The question went to the Supreme Court in 2001. In Whitman v. American Trucking Associations, a unanimous Court, in an opinion by Justice Antonin Scalia, held that the Clean Air Act does not allow the EPA to consider implementation costs when it sets these standards. Congress had said health, and the Court said Congress meant it.

The law built a machine around that idea. States write implementation plans showing how they will meet the standards. Areas that fall short are labelled nonattainment and face stricter requirements on new factories and on traffic planning. New and expanded plants must meet performance standards for their industry. And the citizen suit provision means that if the agency drags its feet on a deadline, a neighbourhood group can ask a judge to enforce it.

What the law did, and what it has cost

The case for the Clean Air Act rests on results most people can see without a chart. Lead was taken out of gasoline over the following decades, and the lead levels in American children's blood dropped dramatically. The brown haze that used to sit over Los Angeles, Denver and Pittsburgh thinned out. Acid rain, the great environmental fear of the 1980s, was cut sharply after Congress added a cap-and-trade program for sulfur dioxide in the 1990 amendments, signed by President George H. W. Bush with large majorities in both chambers.

The EPA's own long-term reviews, prepared with outside scientific advisers, have concluded that the health benefits of the law, mainly fewer early deaths and fewer hospital visits from heart and lung disease, have exceeded its compliance costs by a very wide margin. Critics have argued with the methods behind those estimates. Even so, the basic direction is not seriously disputed: the air got cleaner while the economy grew.

It is fair to state the other side plainly. Businesses paid real money for scrubbers, catalytic converters and permits, and some of those costs fell on workers in coal country and heavy industry. Regulations written for one era sometimes slowed building in another, and permitting delays have hit clean energy projects as well as dirty ones. Progressives who want transmission lines and solar farms built quickly have had to admit that environmental review can be used to block good projects too. A defender of the Clean Air Act should be able to say both things at once: the health standard was right, and the processes around it can be faster without being weaker.

Who still breathes the dirty air

Here is where the history becomes an environmental justice story. National averages improved, but averages hide addresses. The neighbourhoods that sit beside highways, rail yards, ports, refineries and power plants have often been poorer and more likely to be Black, Latino or Native, and many of them were placed there by the zoning and highway decisions of the mid-twentieth century. When regional air got cleaner, those fence-line blocks got cleaner too, but they started from a worse place and they often stayed behind.

The 1970 law was not written with that problem in mind. Its standards apply to whole regions, measured at monitors that can be miles from the street where a diesel truck idles outside an elementary school. A metro area can meet the standard on paper while a single neighbourhood carries a much heavier load. Community groups in places such as West Oakland, the South Bronx and the industrial corridor along the lower Mississippi River in Louisiana spent years installing their own monitors and pressing agencies to look at their blocks rather than the regional average.

Over time the law's own tools have been turned toward that gap. The citizen suit has let neighbourhood groups enforce deadlines. Stricter particle standards, because fine particles concentrate near traffic and industry, help the most exposed places most. And permit reviews, which the 1990 amendments expanded, give communities a formal chance to read what a plant intends to emit and to object.

The fight in the second Trump term

In 2025 the EPA under President Trump proposed to rescind the 2009 finding that greenhouse gases endanger public health and welfare, the legal foundation for federal climate rules on cars and power plants. The administration has also moved to loosen or delay a long list of air rules written in the previous four years, from power plant limits to toxic emissions standards for chemical plants. Some of those changes are being challenged in court, and the results are best followed as they happen on the Court Watch page rather than predicted here.

Here's the argument I would make to anyone, of any party, who is weighing those rollbacks. The 1970 law did not come from one side. It came from a Democratic senator who wanted to be president, a Republican president who wanted to stop him, a House that voted for it almost unanimously and a Senate that did vote for it unanimously. The health-based standard is the single most successful idea in American environmental law, and it was bipartisan from the first day. Weakening it does not undo a partisan project; it undoes a national one.

The new Congress, which Democrats will control after the January 2027 swearing-in, will have oversight power over the EPA again. Oversight is not legislation, and there is no guarantee of any particular outcome. But hearings, document requests and budget riders are the same kind of unshowy tools Muskie used in the 1960s, and they work best when the people asking the questions know the chemistry.

Muskie after the law

Muskie's presidential run in 1972 collapsed early, in New Hampshire, after a disputed episode outside a newspaper office that the press of the day treated as a breakdown. The details of that day have been argued over ever since, and the campaign never recovered. He stayed in the Senate until 1980, when President Jimmy Carter named him Secretary of State. He died in 1996.

His legislative record outlasted the campaign. He also led the Senate work on the Clean Water Act of 1972, which Congress passed over Nixon's veto, and he became the first chairman of the Senate Budget Committee, created by the budget law Congress passed in 1974. It is a career of building institutions rather than winning the top job, and for the people living downwind of a plant, the institutions turned out to be what mattered.

The river in Rumford is cleaner today than it was when he was a boy. That did not happen by itself. It happened because a senator who knew the smell took a dull committee assignment and stayed with it until the country was ready.

What you can do

The Clean Air Act gives individual people more standing than most federal laws do. These are places to start using it.

• Look up the regulated facilities close to your home on the polluters page, which lists EPA-regulated sites by ZIP code with their recorded violations and penalties. If a plant has a long violation history, that is worth raising with your state air agency and at its next permit renewal.
• Check the public comment list, which shows federal rules open for comment with the soonest deadlines first, grouped by issue. Air rules and their rollbacks appear there, and a specific comment from someone who lives near the affected source carries weight.
• Find your representative and senators through the representatives lookup and ask a direct question: will they use the new majority's oversight power to examine the EPA's air rule changes? Their recent votes are on the same page.
• Follow the broader fight over who bears pollution on the environmental justice topic page, and connect with a local environmental group through the organizations directory, which lists nonprofits by cause in every state.

Muskie's real lesson is about patience. The law that cleaned the air of a continent started with one person who decided a boring subcommittee was worth his whole attention.