Community
Air Quality

Using the charts: Items in the legend below the chart can be clicked on and off to aid in analysis. The chart can also be printed or exported as an image or document using the menu at the top right of the chart. See a Guide to the Westchester Index Website for more information.





Source: U.S. Environmental Protection Agency

What does this measure?

The percentage of days for which air quality was monitored and found to be good, indicating healthy air both for sensitive groups, such as people with asthma, and for the population as a whole. The Air Quality Index (AQI) summarizes levels of ground-level ozone, particulate matter (soot and other particles), carbon monoxide, sulfur dioxide, and nitrogen dioxide into one measure.

Why is this important?

Exposure to these pollutants can cause short-term health effects such as irritation to the eyes, nose and throat, coughing, sneezing, runny nose, and shortness of breath. Continued exposure can also worsen medical conditions such as asthma and heart disease.

How is Westchester County performing?

In 2020, 90% of days with air quality measurements in Westchester County were good air days, similar to the rate in 2019, but an 11-point increase from 2000. The low was 66% good air days in 2007. Compared to similar counties, Westchester had the lowest percentage of good air days in 2020; Putnam had the highest at 98%, followed by Nassau at 95% and Rockland at 93%.

Notes about the data

The availability of data depends on the location of EPA monitoring stations.

Days with Good Air Quality
200020012002200320042005200620072008200920102011201220132014201520162017201820192020
Westchester County81%71%75%81%85%75%79%66%71%77%74%73%80%82%82%79%82%90%87%90%90%
Nassau County76%74%78%83%84%83%86%63%63%72%72%67%77%80%85%85%92%94%93%95%95%
Putnam County89%81%78%85%87%84%89%85%88%95%86%94%93%96%95%93%89%94%94%96%98%
Rockland County86%76%79%81%81%85%80%83%93%88%92%93%

Source: U.S. Environmental Protection Agency
Notes: Data were not available for the state or for some counties because they do not have air quality monitoring stations.




Number of Days with Good Air Quality
200020012002200320042005200620072008200920102011201220132014201520162017201820192020
Westchester County287257261291298272274239260280271263292300299290300327316330327
Nassau County276265284295303295312230232263262244276291310310337342340344347
Putnam County326294279310316304317311322345315330334351345338322339332348350
Rockland County178277270290297311293303340320335340

Source: U.S. Environmental Protection Agency
Notes: Data were not available for the state or for some counties because they do not have air quality monitoring stations.








INDICATORS TREND | WESTCHESTER
Early Prenatal Care, by Mother's Race/Ethnicity 1
Increasing
Infant Mortality Rate, by Race/Ethnicity 10 Not Applicable*
Children with Elevated Blood Lead Levels 0
Maintaining
Children Receiving Subsidized Child Care -1
Decreasing
Children Living in Poverty, by Race/Ethnicity 1
Increasing
Disengaged Youth, Ages 16 to 19 -1
Decreasing
Single-Parent Families, by Race/Ethnicity 1
Increasing
Single Female-Headed Households 0
Maintaining
Contributions as a Percentage of Income 0
Maintaining
Voter Registration Rate 1
Increasing
Voter Participation Rate 1
Increasing
Serious Crimes -1
Decreasing
Victims of Domestic Violence -1
Decreasing
Arrest Rates, by Race/Ethnicity 10 Not Applicable*
Households With Internet Access, by Race/Ethnicity 10 Not Applicable*
Households without Vehicles -1
Decreasing
Means of Transportation to Work, by Race/Ethnicity -1
Decreasing
Air Quality 1
Increasing
Population Density 0
Maintaining
Water Quality of the Long Island Sound 1
Increasing
Open Space in Westchester County 1
Increasing
Change in Total Population 1
Increasing
Change in Population, by Race/Ethnicity 1
Increasing
Change in Population, by Age -1
Decreasing
People with Disabilities 1
Increasing
Language Diversity 1
Increasing
People 65 or Older Living Alone 1
Increasing
Change in Total Jobs -1
Decreasing
Change in Jobs by Sector 10 Not Applicable*
Business Ownership, by Race/Ethnicity 10 Not Applicable*
Average Salary by Sector 10 Not Applicable*
Median Household Income, by Race/Ethnicity 0
Maintaining
Female to Male Earnings Ratio 0
Maintaining
Unemployment Rate, by Race/Ethnicity 1
Increasing
People Living in Poverty -1
Decreasing
People Living in Poverty, by Race/Ethnicity 0
Maintaining
Seniors Living in Poverty 0
Maintaining
Seniors Living in Poverty, by Race/Ethnicity 1
Increasing
Food Insecurity -1
Decreasing
Households Receiving SNAP, by Race/Ethnicity 0
Maintaining
Public Assistance 0
Maintaining
People Receiving Supplemental Security Income 1
Increasing
Homeownership Rate, by Race/Ethnicity 1
Increasing
Cost of Homeownership, by Race/Ethnicity 10 Not Applicable*
Overall Housing Cost Burden -1
Decreasing
Cost of Rent, by Race/Ethnicity 10 Not Applicable*
Rent Burdened Households -1
Decreasing
Homelessness, by Race/Ethnicity 10 Not Applicable*
Homelessness, by Sex 10 Not Applicable*
Per-Student Spending 0
Maintaining
Student Suspensions -1
Decreasing
Student Performance on Grade 3 English, by Race/Ethnicity 1
Increasing
High School Cohort Graduation Rate, by Race/Ethnicity 1
Increasing
College Admission Rate, by Race/Ethnicity 1
Increasing
College Enrollment Rate, by Race/Ethnicity -1
Decreasing
Education Levels of Adults, by Race/Ethnicity 1
Increasing
People Without Health Insurance -1
Decreasing
Mortality Rate, by Race/Ethnicity 10 Not Applicable*
Mortality Rate from Chronic Lower Respiratory Disease, by Race/Ethnicity 10 Not Applicable*
Diabetes Mortality, by Race/Ethnicity 10 Not Applicable*
Suicide Rates, by Race/Ethnicity 10 Not Applicable*


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