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EPA AirNow vs Weatherstack

EPA AirNow logo

EPA AirNow

Weather

Official U.S. government air quality information

From
Free
Rated
-
Full reviewWebsite
Weatherstack logo

Weatherstack

Weather

Real-time weather API trusted by thousands

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; Weatherstack the free tier allows 100 API calls a month, which is a demo rather than a usable allowance
  • They diverge on capability: EPA AirNow covers Official AQI data, Weatherstack covers Real-time weather.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where EPA AirNow and Weatherstack differ
AttributeEPA AirNowWeatherstack
Pricing modelfreefreemium
PlatformsiOS, Android, WebApi
Founded19702016

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

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
  • API access
  • Data feeds
  • Widgets
  • API

Only in Weatherstack

  • Real-time weather
  • Historical data
  • Forecasts
  • Location lookup
  • Bulk queries
  • REST API
  • JSON responses
  • HTTPS

Both cover

  • Api 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 Weatherstack
  • Viewing next-day AQI forecasts to plan outdoor activitiesnot Weatherstack
  • Monitoring wildfire smoke via the Fire and Smoke Map (built with the U.S. Forest Service)not Weatherstack
  • Saving multiple locations for quick referencenot Weatherstack
  • Receiving optional push notifications for local AQI forecastsnot Weatherstack

Weatherstack

  • Current weather lookups by location in an applicationnot EPA AirNow
  • Historical weather data for analysis on the paid tiersnot EPA AirNow
  • Short and medium range forecastsnot EPA AirNow
  • Bulk location queries on the higher plansnot 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

Weatherstack

  • The free tier allows 100 API calls a month, which is a demo rather than a usable allowance
  • Historical weather data starts at the Standard plan, $9.99 a month for 50,000 calls
  • Forecasting is tiered: 7 days from Professional at $49.99 a month and 14 days from Business at $99.99
  • Multi-language responses and bulk queries need Professional or above
  • Going past the monthly quota incurs overage charges rather than throttling

Pricing, plan by plan

EPA AirNow

Free

No published plan breakdown. See the EPA AirNow review.

Weatherstack

Free
  • FreeFree
    • 250 calls/month
    • Current weather
    • Basic data
  • Standard$9.99/month
    • 50,000 calls/month
    • Forecasts
    • Historical

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 Weatherstack if

  • You need real-time weather.
  • You want to start without paying.
  • You work on Api.
  • You also want historical data.
Weatherstack review

Questions people ask

Is EPA AirNow or Weatherstack better?
Neither clearly leads. EPA AirNow starts at Free and Weatherstack at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, EPA AirNow or Weatherstack?
EPA AirNow starts at Free and Weatherstack at Free.
Does EPA AirNow or Weatherstack run on more platforms?
EPA AirNow runs on iOS, Android, Web. Weatherstack runs on Api.
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 Weatherstack is typically brought in for.
What can EPA AirNow do that Weatherstack cannot?
EPA AirNow covers Official AQI data, Air quality forecasts, Fire & smoke data, Health recommendations. Weatherstack covers Real-time weather, Historical data, Forecasts, Location lookup. Both handle Api 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
Weatherstack: Is there a free plan for Weatherstack?

Yes, Weatherstack has a free plan that includes 100 API calls per month with real-time weather data and HTTPS encryption.

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
Weatherstack: What is the cheapest paid plan for Weatherstack?

The Standard plan costs $9.99 per month (or $8.99 monthly when billed annually) and includes 50,000 API calls per month.

Source
Weatherstack: Do Weatherstack's paid plans allow overage charges beyond the monthly limit?

Yes, all paid tiers allow overage charges for API calls beyond the monthly allocation.

Source
Weatherstack: How much can I save with annual billing on Weatherstack?

Annual billing offers up to 15% savings compared to monthly payments across all paid tiers.

Source
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