Air Quality in Joliet, Illinois — Live

Live readings from PurpleAir sensors across Joliet — with free alerts when diesel traffic or summer ozone push the air into unhealthy territory.

Live Joliet AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Joliet and Plainfield, New Lenox, Shorewood, Crest Hill.

Joliet's air is usually fine — most days sit in the Good to Moderate range, and there's no dramatic wildfire season here the way there is out West. What actually drives the numbers is a different kind of geography: Joliet sits inside the country's largest inland port, at the crossroads of I-55 and I-80, where diesel trucks move containers out of the CenterPoint Intermodal Center and the BNSF and Union Pacific rail yards around the clock. In summer, that truck exhaust combines with heat and humidity to push ground-level ozone up across greater Chicago, and Will County — including Joliet — sits inside the federally designated Chicago ozone nonattainment area.

Canairy watches the sensors around your home, your kids' school, and everywhere else you care about, and tells you in plain English when the air changes enough to matter.

Joliet is the heart of the country's largest inland port

The CenterPoint Intermodal Center spans roughly 6,500 acres across Joliet and neighboring Elwood, built on land that was once the Joliet Army Ammunition Plant. Inside it, BNSF's 770-acre Logistics Park Chicago and the separate Union Pacific Joliet Intermodal Terminal move shipping containers between trains and trucks bound for the I-55/I-80 interchange, one of the busiest freight crossroads in the country. Amazon, Walmart, and dozens of other distribution centers have followed the rail yards in, and Amazon alone now employs roughly 3,500 people in the area.

All of that freight moves by diesel truck for the last mile, and Joliet residents feel it directly: idling engines, truck routes that run past homes and schools, and the fine particulate exhaust that comes with both. A statewide Environmental Defense Fund analysis found that more than 1 in 4 Illinois residents live within half a mile of a warehouse, with facilities concentrated in exactly this kind of freight corridor — and Joliet sits at the center of it, not on the edge.

State lawmakers are pushing back on warehouse diesel pollution

In February 2026, state Sen. Rachel Ventura, who represents Joliet, introduced what she called 'first in the nation' legislation — the Warehouse Pollution Reduction Act, SB3732 — aimed squarely at the diesel truck traffic ringing the city. The bill would have required emissions monitoring at large warehouses, kept truck bays farther from schools, and funded zero-emission infrastructure through a new state fee on warehouse operators.

Ventura was direct about why the bill mattered to her district: 'That truck pollution, especially the diesel particulate matter, has caused a lot of asthma in our area,' she said. The bill missed its committee deadline and didn't advance in the spring 2026 session, but a Joliet-area senator introducing it at all reflects how much local frustration with warehouse-corridor air has built up — this isn't an abstract regulatory debate here, it's about the trucks most Joliet residents drive alongside every day.

Summer brings a second problem: ozone

Will County, including Joliet, is part of the Chicago-Naperville-Elgin ozone nonattainment area, which the EPA designated 'marginal' for the 2015 ozone standard in June 2018. Ground-level ozone forms when vehicle and industrial exhaust cooks in summer heat and sunlight, and the exhaust from tens of thousands of daily truck trips through the CenterPoint corridor is a meaningful part of that mix, alongside the ExxonMobil refinery in neighboring Channahon, about ten miles southwest, which processes roughly 264,000 barrels of crude oil a day.

That refinery has had its own air emissions problems — a federal enforcement action required ExxonMobil to pay $1.5 million in penalties and invest about $10 million in emissions-control upgrades after EPA and Illinois regulators found violations. None of this means Joliet's air is bad every day; it means the bad days cluster in a predictable pattern — hot, still summer afternoons, and stretches when the wind carries corridor or refinery exhaust toward town instead of away from it.

Joliet air quality FAQ

What is the air quality in Joliet right now?

This page shows the current AQI for Joliet, calculated from PurpleAir sensors across the city and updated continuously. The map below shows every live sensor, so you can check the reading closest to your own neighborhood, including near the I-55/I-80 warehouse corridor.

Why does Joliet's air quality vary so much by neighborhood?

Joliet sits inside the CenterPoint Intermodal Center, one of the largest inland ports in the country, where diesel trucks move containers between rail yards and the I-55/I-80 interchange around the clock. Neighborhoods closest to the warehouse corridor and truck routes tend to see higher fine-particle readings than neighborhoods farther away, which is why a single citywide number can hide a lot — Canairy reads sensors near the places you actually saved instead.

Does Joliet have an ozone problem in summer?

Yes. Will County, including Joliet, is part of the Chicago-Naperville-Elgin area that the EPA designated marginal nonattainment for ground-level ozone under the 2015 standard. Hot, sunny, low-wind days in summer are when ozone tends to climb, driven by the same vehicle and industrial exhaust that fills the warehouse corridor year-round.

What AQI level is unhealthy?

Under the US EPA scale, AQI 0-50 is Good and 51-100 is Moderate. From 101 the air is Unhealthy for Sensitive Groups - kids, older adults, and people with asthma or heart conditions - and above 150 it's Unhealthy for everyone. Canairy translates these numbers into a plain-English verdict, like whether to close the windows or move a workout indoors.

Where does Canairy's Joliet data come from?

Readings come from PurpleAir's network of laser particle sensors across Joliet and surrounding towns, cross-referenced with government monitors and the Google Air Quality API. You can see every sensor behind your numbers on the live map - there's no black box.

Is Canairy free?

Yes. The Canairy app is free to download and includes live air quality for all your saved places, plain-English verdicts, and free push alerts when the air crosses your threshold. A paid plan adds extras like SMS text alerts.

Get Canairy free on Google Play.