Short version: at Yokkaichi Municipal Museum, the free permanent floors beat the paid special exhibition by a mile.
I didn't go in with big plans. I was near Yokkaichi Station, trying to decide between the museum and a shopping mall, and the museum won more or less on a coin flip.
The special exhibition at the time was the "Nyan-Nyan Museum," which opened on September 19, 2026. Adult tickets are ¥1,000, and the whole idea is famous artworks and historical scenes redone as cat parodies.[1]
Honestly? It didn't do much for me.
The first few pieces are funny: "Ha, it's a cat now." But after a while it starts to feel like turn it into a cat and call it a day. And the cats weren't cute enough, at least for me, to carry the whole show.
The punchline is a cat. That's it.
Then I went down to the third floor, and the museum suddenly got serious.
1. The free third and second floors are the main event
The third-floor permanent exhibition, "Time-Space Highway," is free. It has life-size recreations of a Yayoi-period pit house, the old market town that held a market on days with a "four" in the date, and Yokkaichi as an Edo-period post town on the old highway. Head down to the second floor, to the Yokkaichi Pollution and Environmental Future Museum, and the story keeps going from the late 1800s to today and beyond.[2][3]
The museum actually built the two floors to be seen together, as one timeline from the earliest days to now.[2]
And it works really well.
It's not just "here are some old tools." It's one continuous path through the same building:
ancient legends → prehistoric life → markets → post town → 20th-century homes → wartime bombing → postwar rebuilding → petrochemical plants → Yokkaichi pollution → today's clean-air controls.
Do not show up right before closing like I almost did.
2. It starts with a legendary prince, then prehistoric people beat you at fishing
The first surprise: Yokkaichi's story goes all the way back to the legend of Yamatotakeru, a prince from Japan's oldest myths.
City heritage documents record the local legend of Tsue-tsuki-zaka, the "walking-stick slope." On his way back from the east, Yamatotakeru is said to have climbed a steep slope near Uneme leaning on a staff. The Kojiki, Japan's oldest chronicle, says his legs were so tired they felt folded in three, and that line is tied to a traditional story about how Mie Prefecture got its name.[4]
To be clear, this is a local legend, not proven history.
A bit further on, the displays about prehistoric life show fishing tools and what people ate.
This is where modern humans take a painful loss.
People thousands of years ago could catch fish, and yet some of us go out with modern gear and come home empty-handed every single time.
Civilization moved forward. Our fishing skills went backward.
And back then, catching nothing wasn't a bad day at your hobby. It meant less dinner. No phone, no supermarket, no fridge. Ten minutes in this section and "I'm so glad I wasn't born back then" stops being a joke.
3. Even the word "doujinshi" meant something totally different
The third floor also has a memorial room for Fumio Niwa, a novelist born in Yokkaichi.
One of the items is a literary magazine called Bungakusha. If you know "doujinshi" from anime and manga fan culture, the word throws you for a second. Here it means something older: a small magazine where a group of aspiring writers published their work together. Niwa put his own money into keeping Bungakusha going and helped young writers get their start.[5]
Same word, completely different picture in your head.
The museum doesn't just show how objects change over time. It shows how the meaning of words drifts too.
4. Early 1900s homes look exhausting, then 1961 suddenly feels livable
Walking through the recreated old houses, you realize how much housework we now hand off to machines.
Water, fire, keeping food fresh, laundry, lighting. Back then, just living was a full-time job.
Then you reach the postwar section, with a room recreating daily life around 1961, and the feeling changes instantly.
"Okay, from here on I could survive."
A sink, a dining table, electric appliances. In just a few decades, everyday life got way easier.
Washing machines and fridges haven't been normal in homes for as long as it feels. Today we hand off laundry, cooling, heating, hot water, communication, and even deliveries to machines and public services.
So if losing your phone makes you want to scream "I can't live like this!", it's not just that people got weaker. We've built a life where technology works as our extra brain and extra muscles.
At this point I was fully on team "modern life is the best."
Then Yokkaichi's history takes a much darker turn.
5. Before life got easy, the city was bombed nine times
Between June 18 and August 8, 1945, Yokkaichi was hit by nine air raids. A 2026 city document puts the toll at more than 800 dead and 49,198 people affected.[6]
Why was it targeted so many times?
From the late 1920s on, Yokkaichi shifted from light industry to heavy and chemical industry, and military plants such as the Second Naval Fuel Depot were built there. Near the end of the war, those plants were key suppliers for the military, so the US bombed them.[7]
In other words:
The same industry that made the city grow also made it a target in wartime.
On top of that, on July 24 and August 8, 1945, "Pumpkin" bombs, practice bombs shaped like the atomic bomb and used to train for dropping it, were dropped on Yokkaichi.[7]
Here the museum's story jumps from "life used to be inconvenient" to "what a city produces can decide who lives and who dies."
6. After the rebuild, the air itself started wrecking daily life
After the war, Japan rebuilt and then went through a period of rapid economic growth. Yokkaichi built huge petrochemical plants, and with them came industry and jobs.
It also brought pollution.
After the first plant complex started up, residents complained about noise, soot and smoke, shaking, and bad smells. Burning crude oil high in sulfur, among other things, released huge amounts of sulfur dioxide. Asthma and other breathing problems spread among locals, and the illness came to be known as "Yokkaichi asthma."[8][9]
What hit me hardest wasn't the name of the disease. It was the numbers about everyday life.
A panel I saw on the day showed a survey where about half of people said they couldn't sleep properly. I'm reporting this as something I saw in the exhibit, not as a number I could double-check online.
Bad smells, noise, coughing, windows you can't open, nights you can't sleep.
That's not "it smelled a bit near the factories."
People's whole living environment was falling apart.
It wasn't just a problem for the people who got sick. It reached into every night's sleep, the next day's work, school, laundry hanging outside, meals, and the inside of people's homes.
No wonder the pollution section feels long. It didn't end once the problem appeared. Someone had to measure the causes, support the patients, go to court, write rules, change factory equipment, and keep checking for decades.
In 1967, nine officially recognized pollution patients from the Isozu area sued six companies in the first plant complex. The court ruled in 1972.[10]
7. So is Yokkaichi's industrial complex safe now, in 2026?
After all that, you can't help asking:
"Okay, but what about the giant plants that are still out there?"
Short answer: the air is far cleaner than in the Yokkaichi asthma days. But this is still a huge oil, chemical, and gas hub, so the risk isn't zero.
In fiscal 2024 testing, sulfur dioxide met Japan's air standards at every monitoring station, and Isozu and some other spots averaged 0.001 ppm for the year. Nitrogen dioxide, floating dust particles, and PM2.5 also met the standards at every station. The one miss was photochemical smog, which is hard to keep under the limit anywhere in Japan.[11]
The city's own pollution history says that thanks to rules and pollution-control projects, sulfur dioxide had come down to a good level from fiscal 1976 onward.[12]
So what changed?
The plants didn't stop handling dangerous stuff. What got much stronger is everything around it: emission limits, cleanup equipment, testing, round-the-clock monitoring, and disaster planning.
8. It's still all oil and gas, because we'd be stuck without it
The Yokkaichi waterfront still handles so much oil and high-pressure gas that it's officially designated as a special disaster-prevention zone. As of January 1, 2026, the zone covered 11.01 km², handled 6,805 thousand kiloliters of oil and 57.86 million Nm³ of high-pressure gas, and had 34 designated facilities.[13]
Mie Prefecture's 2026 disaster plan spells out who does what, from companies to fire departments to government, with safety first, covering both preventing disasters and responding to them. Its latest risk study also includes new damage estimates for a possible Nankai Trough earthquake.[14]
So yes, it's still very much a giant oil, gas, and petrochemical zone.
But "if it's dangerous, just shut it all down" isn't that simple either.
It's not only fuel. Plastics, synthetic rubber, chemicals, industrial gases, and all kinds of materials that modern life and factories depend on come from industries like this. Yokkaichi is keeping the complex as a core part of its economy while running an ongoing committee to move it toward carbon neutrality.[15]
We need it. So the real question isn't "shut it down or leave it alone." It's how safely and how cleanly we can run the industries we need.
By this point, the pollution exhibit isn't just "companies were evil back then."
We want an easy life. We need industry. But we don't want to lose clean air, sleep, or our health either.
The exhibit shows how society spent decades turning that messy balancing act into laws and technology.
9. I came for cats and left thinking about civilization
When I walked in, my mood was basically "oh, cool, a cat exhibit."
By the time I left, it was:
Prehistoric people could catch fish. Respect.
Early 1900s life: way too hard.
Around 1961: okay, I could live here.
Nine air raids: heavy.
Pollution that even steals your sleep: brutal.
Today's pollution controls: impressive.
But we still can't do without the industry.
That emotional rollercoaster is what makes Yokkaichi Municipal Museum so good.
The third-floor "Time-Space Highway" and the second-floor Yokkaichi Pollution and Environmental Future Museum are both free.[3] Even if you skip the special exhibition, these two floors alone tell one connected story: how life got easier, what that convenience cost, and how people fixed it.
As of September 2026, the museum is normally open 9:30 to 17:00, with last entry to exhibitions at 16:30. The third and second floors are free. The "Nyan-Nyan Museum" special exhibition runs until November 23, and adult tickets are ¥1,000.[3][1]
If the cats don't win you over, no problem.
Thousands of years of Yokkaichi are waiting downstairs.
Sources
[2]–[15]: see the shared list of references at the end of the article.
References (15)
- 四日市市立博物館「令和8年度年間案内／猫猫はくぶつかん」 city.yokkaichi.mie.jp
- 四日市市立博物館「常設展 時空街道」 city.yokkaichi.mie.jp
- 四日市市立博物館「開館時間・観覧料・アクセス」 city.yokkaichi.mie.jp
- 四日市市「文化財保存活用地域計画資料・古代史の舞台」 www5.city.yokkaichi.mie.jp
- 四日市市立博物館「丹羽文雄記念室」 city.yokkaichi.mie.jp
- 四日市市「四日市空襲犠牲者慰霊献花式（2026）」 city.yokkaichi.lg.jp
- 四日市市「四日市空襲と戦時下のくらし（2026）」 city.yokkaichi.lg.jp
- 四日市公害と環境未来館「四日市公害について」 city.yokkaichi.mie.jp
- 同「大気汚染」 city.yokkaichi.mie.jp
- 同「裁判・訴訟」 city.yokkaichi.mie.jp
- 四日市市「令和6年度大気環境測定結果」 city.yokkaichi.lg.jp
- 同「公害防止事業」 city.yokkaichi.mie.jp
- 三重県「三重県の石油コンビナート」 pref.mie.lg.jp
- 三重県「石油コンビナート等防災計画について」 pref.mie.lg.jp
- 四日市市「四日市コンビナートカーボンニュートラル化推進委員会」 city.yokkaichi.lg.jp
