Bad Air Days in Norfolk City, Virginia: 0 a Year
0 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 991 of 996 monitored counties, where 1 is worst.
What to buy, and what not to
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
The record for Norfolk City
In 2000 to 2009 this county averaged 2 bad days a year; in 2016 to 2025, 0. Not much has changed.
| Date | AQI | Main pollutant |
|---|---|---|
| 2023-06-29 | 96 | PM2.5 |
| 2025-08-07 | 94 | PM2.5 |
| 2021-07-21 | 85 | PM2.5 |
| 2024-03-15 | 82 | PM2.5 |
| 2025-11-21 | 80 | NO2 |
The air on a normal day
Across 3,635 monitored days from 2016 to 2025, the air in Norfolk City rated Good on 93% of them, more often than the 72% typical of monitored counties, and Moderate on 7%. The median day sat at AQI 21; one day in ten went above 45.
The pollutant setting the AQI on an ordinary day here:
- nitrogen dioxide57%2,073 days
- fine particles (PM2.5)41%1,482 days
- carbon monoxide2%75 days
Norfolk City by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 363 | 312 | 51 | 0 | 0 | 33 | 94 |
| 2024 | 366 | 314 | 52 | 0 | 0 | 32 | 82 |
| 2023 | 364 | 334 | 30 | 0 | 0 | 18 | 96 |
| 2022 | 361 | 348 | 13 | 0 | 0 | 18 | 66 |
| 2021 | 362 | 340 | 22 | 0 | 0 | 18 | 85 |
| 2020 | 365 | 349 | 16 | 0 | 0 | 18 | 64 |
| 2019 | 364 | 341 | 23 | 0 | 0 | 20 | 72 |
| 2018 | 365 | 348 | 17 | 0 | 0 | 18 | 65 |
| 2017 | 363 | 335 | 28 | 0 | 0 | 19 | 66 |
| 2016 | 362 | 344 | 18 | 0 | 0 | 19 | 63 |
| 2015 | 365 | 332 | 33 | 0 | 0 | 21 | 79 |
| 2014 | 365 | 318 | 47 | 0 | 0 | 22 | 69 |
| 2013 | 365 | 329 | 36 | 0 | 0 | 21 | 74 |
| 2012 | 366 | 328 | 38 | 0 | 0 | 23 | 87 |
| 2011 | 361 | 303 | 55 | 3 | 0 | 25 | 119 |
| 2010 | 122 | 60 | 62 | 0 | 0 | 52 | 97 |
*2025 may be a partial year in EPA's file.
Virginia compared
- Arlington County3/yr
- Fairfax County3/yr
- Henrico County1/yr
- Loudoun County1/yr
- Frederick County1/yr
- Bristol Citythin data
- Suffolk Cityunder 1/yr
- Alexandria Citythin data
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.