Number of days with unhealthy air pollution in the U.S. 2000-2023

Published by Ian Tiseo, Jan 30, 2025

In 2023, there were 822 unhealthy days for ozone and fine particle pollution in the United States. Although this was an increase of more than 220 days from the previous year, the number of unhealthy air days in the U.S. has shown long-term improvement over the past two decades. In the first years of the 2000s, the number of days reaching unhealthy for sensitive groups or above the AQI was typically more than 2,000.

Number of unhealthy air quality days in the United States from 2000 to 2023

CharacteristicNumber of days
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
Showing entries 1 to 13 (24 entries in total)
Statistic: Number of unhealthy air quality days in the United States from 2000 to 2023

© Statista 2025
Download
Show detailed source information?
Register for free
Already a member?
Log in
Source

Use Ask Statista Research Service

Release date

July 2024

Region

United States

Survey time period

2000 to 2023

Special properties

Number of days reaching unhealthy for sensitive groups level or above on the Air Quality Index (AQI) based on 35 major U.S. cities for ozone and PM2.5 combined.

Citation formats
Access all statistics starting from $2,388 USD yearly *

* For commercial use only

Basic Account

For single users
$0 USD
Always free
Access limited to Free Statistics. Premium Statistics are not included.
  • Free Statistics
Based on your interests

Starter Account

For single users
$199 USD
per month, billed annually 1
Buy now
  • Free Statistics
  • Premium Statistics

    • The statistic on this page is a Premium Statistic and is included in this account.

Professional Account

For teams of up to 5 people
$1,299 USD
per month, billed annually 1
Buy now
  • Free + Premium Statistics
  • Reports
  • Market Insights

1 All prices do not include sales tax. The account requires an annual contract and will renew after one year to the regular list price.

Compare accounts

Statistics on " Air pollution in the U.S. "

Other statistics that may interest you Air pollution in the U.S.

Health risks

5

Emissions

6

Sources

5

Exposure

5

Overview

5

Further related statistics

15

Further Content: You might find this interesting as well

Statistics

Topics

Air pollution in the U.S.Greenhouse gas emissions in the U.S.Environmental pollution worldwideEnvironmental pollution in the U.S.Cleantech in the U.S.
All features, all contents, at all times: Learn more about our professional solutions.

* For commercial use only

Basic Account

For single users
$0 USD
Always free
Access limited to Free Statistics. Premium Statistics are not included.
  • Free Statistics
Based on your interests

Starter Account

For single users
$199 USD
per month, billed annually 1
Buy now
  • Free Statistics
  • Premium Statistics

    • The statistic on this page is a Premium Statistic and is included in this account.

Professional Account

For teams of up to 5 people
$1,299 USD
per month, billed annually 1
Buy now
  • Free + Premium Statistics
  • Reports
  • Market Insights

1 All prices do not include sales tax. The account requires an annual contract and will renew after one year to the regular list price.

Compare accounts
Learn more about how Statista can support your business.