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New York City Department of Health, Environment & Health Data Portal. Air quality data: . Accessed at https://a816-dohbesp.nyc.gov/IndicatorPublic/data-explorer/air-quality/ on Oct 19, 2026. Copy citation.

Fine particles (PM 2.5)

Concentration of fine particles in the air. Fine particles are emitted by vehicles, building boilers, and other combustion — and are a major form of air pollution that harms health. Neighborhood sensors measure PM2.5 at the street-level, where people are most active. These sensors are designed to let us measure differences in air pollution over time and locations within New York City.

Black carbon

Concentration of black carbon in the air. Black carbon is a major component of fine particles, which contribute to both short-term health effects and chronic illness

Nitric oxide (NO)

Concentration of nitric oxide in the air. Nitric oxide is formed by combusion, causes breathing problems, and contributes to smog and acid rain.

Nitrogen dioxide (NO2)

Concentration of nitrogen dioxide in the air. Nitrogen dioxide is a pollutant formed by combustion. It causes breathing problems and contributes to smog and acid rain.

Ozone (O3)

Concentration of ozone in the air. Ozone is a common air pollutant that can harm breathing and worsen respiratory conditions.

Sulfur dioxide (SO2)

Concentration of sulfur dioxide in the air. Sulfur dioxide comes from burning some kinds of fuel oil. It can worsen lung diseases.

Regulatory PM2.5 monitoring

Concentration of fine particles in the air. Fine particles are emitted by vehicles, building boilers, and other combustion - and are a major form of air pollution that harms health. Regulatory PM2.5 sensors collect readings on the tops of buildings that measure regional changes in air quality for the federal Clean Air Act. This indicator is one of the federal standards for PM2.5 (9.0 µg/m3).

Air quality action days

Days when air quality is unhealthy. Action days for sensitive groups are counted when either ozone or PM2.5 levels are above 100, and for the general population when levels are above 150.

Fine particles (PM 2.5) action days

Days when PM2.5 is at an unhealthy level. PM2.5 is emitted by combustion and are a major form of air pollution that harms health. PM2.5 action days are when the AQI is above 100, mainly due to PM2.5

Ozone action days

Days when ozone levels are at unhealthy levels. Ozone is a common air pollutant that can harm breathing and worsen asthma and other respiratory conditions. Ozone action days are when the AQI is above 100, mainly due to ozone.

Air quality

Air quality is a measure of the condition of the air around us. The less air pollution there is, the better the air quality.

Like many cities, New York City’s air contains particles, liquid droplets, gases, and other contaminants that could impact health. Two pollutants, particulate matter and ground-level ozone, are of particular health concern.

Although New York City’s air does not currently meet federal air quality standards, it has improved significantly over the past two decades.

Air Pollution and Health

Pollutants may affect human health negatively in a variety of ways. People may experience symptoms and health issues such as:

Air pollution may affect anyone. Certain groups may be more vulnerable to health risks from poor air quality, such as:

To Reduce Health Risks

About Neighborhood Air Quality

Air quality can vary from neighborhood to neighborhood. That is why the New York City Community Air Survey (NYCCAS) keeps track of street-level air pollution from about 100 locations throughout New York City every season. NYCCAS is part of OneNYC, New York City’s long-term plan for sustainability.

In NYC, health impacts from fine particulate matter, black carbon, and sulfur dioxide are higher in high-poverty neighborhoods.

Concerned about this? Email your elected officials.