essential needs
Percent of Days with Good Air Quality

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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 Norfolk County doing?

In 2021, 88% of days were good air days, down from the rate in 2020, but 17 points higher than 2000.

Norfolk had the lowest percentage of good air days in 2021, just behind Essex County at 89%. Middlesex County, MA had the highest at 93%. All counties have had an increase in the number of good air days since 2000.

Notes about the data

Comparable national and state data is not available due to the quantity and location of EPA monitoring stations. Data for this indicator are expected to be released annually in July.

standard
Days with Good Air Quality
2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021
Norfolk County71%63%55%74%76%74%77%74%74%84%82%83%81%88%88%87%90%93%95%97%96%88%
Essex County68%74%73%80%75%65%70%63%67%76%72%68%74%76%83%82%88%88%86%90%90%89%
Middlesex County75%76%80%93%92%86%83%83%88%90%87%92%90%94%95%95%94%96%91%93%93%93%

Source: U.S. Environmental Protection Agency
Notes: The availability of data depends on the location of air monitoring stations.




Number of Days with Good Air Quality
2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021
Norfolk County4530132145212234268246270305300297294322323319330337337352352320
Essex County250270265293274239254229247276262248270276304299321321314329330324
Middlesex County275278292338337313304302321330318334328335338345341341333337340338

Source: U.S. Environmental Protection Agency
Notes: The availability of data depends on the location of air monitoring stations.






INDICATORS TREND
Change in Total Population 1
Increasing
Change in Population by Race/Ethnicity 1
Increasing
Language Diversity 1
Increasing
Foreign-Born Population 1
Increasing
Population by Age 1
Increasing
People with Disabilities 1
Increasing
Voter Registration -1
Decreasing
Voter Participation 1
Increasing
Arrest Rate by Race/Ethnicity 0
Maintaining
Incarceration Rate by Race/Ethnicity 10 Not Applicable*
Change in Total Jobs 10 Not Applicable*
Unemployment Rate 10 Not Applicable*
Unemployment Rate by Race/Ethnicity 0
Maintaining
Living Wage 10 Not Applicable*
Median Household Income 0
Maintaining
Median Household Income by Race/Ethnicity 0
Maintaining
Income in Relation to Poverty Level -1
Decreasing
People Living in Poverty 1
Increasing
People Living in Poverty by Race/Ethnicity -1
Decreasing
People Living in Poverty by Age -1
Decreasing
Children Living in Poverty by Race/Ethnicity 1
Increasing
Females Living in Poverty by Race/Ethnicity -1
Decreasing
Seniors Living in Poverty 1
Increasing
Share of Workers who are Professionals by Race/Ethnicity 10 Not Applicable*
Business Ownership by Race/Ethnicity 10 Not Applicable*
Access to Financial Services by Race/Ethnicity 10 Not Applicable*
Student Performance on Grade 3 English by Student Subgroup 10 Not Applicable*
High School Cohort Graduation Rate by Student Group 10 Not Applicable*
Education Levels of Adults by Race/Ethnicity 1
Increasing
Overall Housing Cost Burden -1
Decreasing
Median Home Value 0
Maintaining
Median Home Value by Race/Ethnicity 10 Not Applicable*
Cost of Homeownership 1
Increasing
Cost of Homeownership by Race/Ethnicity 10 Not Applicable*
Cost of Renting 1
Increasing
Cost of Rent by Race/Ethnicity 10 Not Applicable*
Households Receiving SNAP 1
Increasing
Households Receiving SNAP by Race/Ethnicity -1
Decreasing
Food Insecurity 10 Not Applicable*
Households Without Vehicles 1
Increasing
Means of Transportation to Work by Race/Ethnicity 0
Maintaining
Protected Land 10 Not Applicable*
Percent of Days with Good Air Quality 10 Not Applicable*
Early Prenatal Care 10 Not Applicable*
Early Prenatal Care by Mother's Race/Ethnicity 10 Not Applicable*
Drug Poisoning Mortality Rate 10 Not Applicable*
Substance Abuse Treatment Admissions 10 Not Applicable*
People 65 or Older Living Alone 1
Increasing
Change in Population by Race/Ethnicity 1
Increasing
Arrest Rate by Race/Ethnicity 0
Maintaining
Incarceration Rate by Race/Ethnicity 10 Not Applicable*
Unemployment Rate by Race/Ethnicity 0
Maintaining
Median Household Income by Race/Ethnicity 0
Maintaining
People Living in Poverty by Race/Ethnicity -1
Decreasing
Children Living in Poverty by Race/Ethnicity 1
Increasing
Females Living in Poverty by Race/Ethnicity -1
Decreasing
Share of Workers who are Professionals by Race/Ethnicity 10 Not Applicable*
Business Ownership by Race/Ethnicity 10 Not Applicable*
Student Performance on Grade 3 English by Student Subgroup 10 Not Applicable*
High School Cohort Graduation Rate by Student Group 10 Not Applicable*
Education Levels of Adults by Race/Ethnicity 1
Increasing
Median Home Value by Race/Ethnicity 10 Not Applicable*
Cost of Homeownership by Race/Ethnicity 10 Not Applicable*
Cost of Rent by Race/Ethnicity 10 Not Applicable*
Households Receiving SNAP by Race/Ethnicity -1
Decreasing
Early Prenatal Care by Mother's Race/Ethnicity 10 Not Applicable*



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