SmogRank / World / United States / South Dakota / March 2023

Most unhealthy days in South Dakota, United States, March 2023

5 cities in South Dakota, United States ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Rapid City, United States, 0 of 31 measured days. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 20 of these 31 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; many cities elsewhere are missing from this board, not clean. Why.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Rapid City 0% 0.75%0
Every city in South Dakota, United States ranked for March 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Rapid City
    0 of 31
  2. 2Watertown
    0 of 31
  3. 3Sioux Falls
    0 of 30
  4. 4Aberdeen
    0 of 31
  5. 5Brookings
    0 of 31
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, March 2023 · All cities in United States, March 2023 · South Dakota now

Use this board

SmogRank, most polluted cities in South Dakota, United States, by unhealthy days, PM2.5, March 2023, smogrank.com/us/region/south-dakota/history/2023-03?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.