Air Quality in Cranston, Rhode Island — Live

Live readings from PurpleAir sensors across Cranston — with free alerts when summer ozone or wildfire smoke pushes the air into unhealthy territory.

Live Cranston AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Cranston and Providence, Warwick, Johnston, West Warwick.

Cranston's air is good most of the year. The city is flat and close to Narragansett Bay, with no valley or basin to trap pollution the way parts of California do. The two things that actually push Cranston's air into unhealthy territory are both bigger than the city itself: hot, hazy summer afternoons when ground-level ozone builds up across southern New England, and wildfire smoke drifting down from Canada, which reached Rhode Island twice in 2023.

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.

Cranston's ozone problem starts somewhere else

Rhode Island's entire Providence-Warwick area, Cranston included, is classified nonattainment for ground-level ozone under the EPA's 2015 standard of 70 parts per billion. That's less a Cranston pollution story than a geography one: the state sits at the tail end of the Northeast's I-95 corridor, and a lot of the nitrogen oxides and volatile organic compounds that cook into ozone on hot, sunny days were emitted upwind in Connecticut, New York, and New Jersey before the wind ever carries them here. Cranston adds its own share too — I-95, I-295, Route 10, and Route 37 all cross the city, so idling summer traffic is adding fresh precursor pollution right where people live.

The Rhode Island Department of Environmental Management issues a daily air quality forecast that includes recess guidance for schools on days when ozone is expected to climb, because the sunniest, calmest, hottest summer afternoons are exactly when ozone peaks — typically in the mid-afternoon hours after traffic and heat have had all day to build it up. Those are the days it's worth moving a run or a kid's outdoor practice earlier or later, since ozone irritates the lungs most during hard breathing.

Canadian wildfire smoke reached Cranston twice in 2023

Rhode Island didn't really have a wildfire smoke season until 2023, when Canada's worst fire year on record changed that. On May 30, 2023, the state Department of Environmental Management issued a statewide air quality alert as smoke from wildfires burning in Nova Scotia pushed fine-particle readings into unhealthy territory. A month later it happened again: an alert issued June 30 warned that smoke from wildfires burning farther north in Canada would keep Rhode Island's air unhealthy for fine particles through Saturday, July 1, with light winds giving the smoke nowhere to go.

Both alerts covered the whole state, Cranston included, and both carried the same warning: the fine particles in wildfire smoke are small enough to get past the body's natural defenses and settle deep in the lungs, so anyone with asthma or heart disease should watch closely and everyone else should limit strenuous time outdoors. Cranston can look perfectly clear at street level while the PM2.5 reading tells a very different story — exactly the kind of day a sensor catches and a glance out the window misses.

The smell some Cranston residents know well

Just over the line in neighboring Johnston sits the Central Landfill, a 154-acre site that has taken in roughly 90 percent of Rhode Island's municipal solid waste since 1981 and has been on the EPA's Superfund National Priorities List since 1986. It's operated by the Rhode Island Resource Recovery Corporation, and when its gas-collection system falls behind, the smell travels: residents on Cranston's western side, closest to the Johnston line, have reported stretches of stronger-than-normal odor from the landfill, and the state has confirmed the source.

The odor problem has a paper trail. The landfill's operators settled with the town of Johnston for $5 million over odor complaints in 2015, then settled a Conservation Law Foundation lawsuit the following year by agreeing to add emissions and air quality monitoring and improve gas collection. The EPA later issued the operator a Notice of Violation for failing to meet Clean Air Act permit and reporting requirements, and CLF has pursued further legal action since. It's a gas and odor issue rather than a PM2.5 spike, so it may not always move the AQI number even on a day it's very noticeable outside — but it's the air complaint Cranston residents are most likely to recognize by name.

Cranston air quality FAQ

What is the air quality in Cranston right now?

This page shows the current AQI for Cranston, 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.

Why does Cranston get ozone alerts in summer?

Rhode Island's Providence-Warwick area, including Cranston, is classified nonattainment for ground-level ozone under the EPA's 2015 standard. Much of that ozone forms from pollution carried up the Northeast's I-95 corridor from Connecticut, New York, and New Jersey, then cooks in the heat and sun of a still summer afternoon. Cranston's own stretch of I-95, I-295, Route 10, and Route 37 adds to it locally, which is why ozone tends to peak on the hottest, sunniest, calmest days.

What's that smell in Cranston sometimes?

Residents on Cranston's western side, near the Johnston line, sometimes notice a strong odor from the Central Landfill just over the border in Johnston. The state has confirmed the source, and the site has a history of Clean Air Act violations and legal settlements over it. It's an odor and gas issue rather than a spike in PM2.5, so it may not always show up as a change in the AQI number even when it's very noticeable outside.

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 Cranston data come from?

Readings come from PurpleAir's network of laser particle sensors across Cranston 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.