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EPA AirNow vs VesselFinder

EPA AirNow logo

EPA AirNow

Weather

Official U.S. government air quality information

From
Free
Rated
-
Full reviewWebsite
VesselFinder logo

VesselFinder

Maritime

Free AIS vessel tracking web site

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: EPA AirNow air quality data availability depends on nearby monitoring stations, can show no data found near a location when no monitor is close enough; VesselFinder aPI access is billed in credits, and a satellite AIS position costs 10 credits against 1 for a terrestrial position
  • They diverge on capability: EPA AirNow covers Official AQI data, VesselFinder covers Real-time tracking.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which EPA AirNow and VesselFinder actually diverge.

Attributes where EPA AirNow and VesselFinder differ
AttributeEPA AirNowVesselFinder
Pricing modelfreefreemium
PlatformsiOS, Android, WebWeb, Ios, Android
CategoryWeatherMaritime
Founded19702011

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in EPA AirNow

  • Official AQI data
  • Air quality forecasts
  • Fire & smoke data
  • Health recommendations
  • Data feeds
  • Widgets
  • API
  • Api support

Only in VesselFinder

  • Real-time tracking
  • Vessel database
  • Port information
  • Weather overlay
  • Mobile apps
  • Ios support
  • Android support

Both cover

  • API access
  • Web support

What people use each for

The jobs each tool is most often brought in to do.

EPA AirNow

  • Checking current Air Quality Index (AQI) for a location or any searched areanot VesselFinder
  • Viewing next-day AQI forecasts to plan outdoor activitiesnot VesselFinder
  • Monitoring wildfire smoke via the Fire and Smoke Map (built with the U.S. Forest Service)not VesselFinder
  • Saving multiple locations for quick referencenot VesselFinder
  • Receiving optional push notifications for local AQI forecastsnot VesselFinder

VesselFinder

  • Tracking vessel positions and voyages from AIS datanot EPA AirNow
  • Pulling ship positions and particulars into a logistics or chartering system over an APInot EPA AirNow

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

EPA AirNow

  • Air quality data availability depends on nearby monitoring stations, can show no data found near a location when no monitor is close enough
  • Interactive monitor map (PM2.5, PM10, ozone) coverage documented on the primary source is U.S.-focused
  • As a government-run service it offers no paid tiers, proprietary data sources, or customization options found in commercial weather/air-quality apps

VesselFinder

  • API access is billed in credits, and a satellite AIS position costs 10 credits against 1 for a terrestrial position
  • Credits expire 12 months after purchase
  • Credit packs start at 330 EUR for 10,000 credits, excluding VAT
  • Tracking a vessel outside terrestrial AIS range multiplies the cost of every position tenfold, so open ocean coverage is the expensive case rather than the standard one

Pricing, plan by plan

EPA AirNow

Free

No published plan breakdown. See the EPA AirNow review.

VesselFinder

Free
  • Basic$4.99/month
    • Ad-free
    • Extended history
    • Fleet monitoring

Which should you pick?

Choose EPA AirNow if

  • You need official aqi data.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want air quality forecasts.
EPA AirNow review

Choose VesselFinder if

  • You need real-time tracking.
  • You want to start without paying.
  • You work on Web, Ios, Android.
  • You also want vessel database.
VesselFinder review

Questions people ask

Is EPA AirNow or VesselFinder better?
Neither clearly leads. EPA AirNow starts at Free and VesselFinder at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, EPA AirNow or VesselFinder?
EPA AirNow starts at Free and VesselFinder at Free.
Does EPA AirNow or VesselFinder run on more platforms?
EPA AirNow runs on iOS, Android, Web. VesselFinder runs on Web, Ios, Android.
Can I use EPA AirNow for free?
Both have a free tier, so you can try either at no cost before committing.
What is EPA AirNow best used for?
EPA AirNow is most often used for checking current air quality index (aqi) for a location or any searched area, viewing next-day aqi forecasts to plan outdoor activities, monitoring wildfire smoke via the fire and smoke map (built with the u.s. forest service), saving multiple locations for quick reference. Of those, checking current air quality index (aqi) for a location or any searched area and viewing next-day aqi forecasts to plan outdoor activities are not what VesselFinder is typically brought in for.
What can EPA AirNow do that VesselFinder cannot?
EPA AirNow covers Official AQI data, Air quality forecasts, Fire & smoke data, Health recommendations. VesselFinder covers Real-time tracking, Vessel database, Port information, Weather overlay. Both handle API access, Web support.

Answered from the vendors’ own pages

EPA AirNow: Is AirNow.gov free to use?

Yes. AirNow.gov is a free service operated by the EPA and its partners that provides air quality data, forecasts, maps, and educational resources at no cost to users.

Source
VesselFinder: What are the main pricing tiers for VesselFinder?

VesselFinder offers four tiers: Free (no cost), Basic (4 dollars per month), Premium (34 dollars per month), and Satellite (139 dollars per month).

Source
EPA AirNow: Are there any subscription costs or fees associated with AirNow.gov?

No. AirNow.gov offers all services, data access, and tools completely free. There are no subscription tiers, fees, or payment options of any kind.

Source
VesselFinder: What does the Free plan include?

The Free plan provides terrestrial coverage, 1-day track history, a 10-ship fleet capacity, and 100 route planner uses.

Source
VesselFinder: What tracking capabilities come with the Satellite plan?

The Satellite plan includes both satellite and terrestrial coverage, 90-day track history, 2,000-ship fleet capacity, terminal and berth data, proximity event alerts, and ETA prediction.

Source
VesselFinder: Do subscriptions automatically renew?

No, subscriptions do not renew automatically. Users receive reminder notifications one week before expiration.

Source
VesselFinder: Do the listed prices include VAT?

No, the prices displayed do not include VAT. Payment options include bank transfers and credit or debit cards processed online.

Source
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