MassDEP Ambient Air Quality Monitoring Network & Annual Plan

Learn about which pollutants and parameters the agency measures at specific monitoring sites, and why.

About the Monitoring Network & Plan

The Massachusetts Department of Environmental Protection (MassDEP) operates a network of 24 ambient air quality monitoring stations at locations across the state. The Wampanoag Tribe of Gay Head (Aquinnah) operates an ozone monitoring station on Martha's Vineyard.

Each year, MassDEP is required to submit an Annual Ambient Air Quality Monitoring Network Plan to the U.S. Environmental Protection Agency (EPA). This document and its attachments are subject to a 30-day public comment period before MassDEP submits them to EPA for review and approval.

The annual network plan describes which pollutants and other parameters MassDEP measures at its various ambient air monitoring sites and why they are measured at those specific locations. It also describes changes in the network - including new and closed locations, and new and discontinued measurements at existing locations - since the last network plan, as well as proposed changes in the network over the next 18 months.

MassDEP also must conduct an assessment of the Massachusetts Ambient Air Quality Monitoring Network every five years to determine whether it meets the objectives defined in EPA regulations.

See an archive of all related documents dating back to 2012 here.

Air Monitoring Network Sites Map & Table

Zoom in ( + ) and click on the icons to learn about each monitoring station site across Massachusetts.

Legend of Parameter Acronyms

O3 Ozone
CO Carbon Monoxide
SO2 Sulfur Dioxide
NOx Nitric Oxide, including Nitrogen Dioxide
NOy Total Reactive Oxides of Nitrogen
MET Meteorological Parameters
PM10 Particulate Matter (10 microns & smaller)
PM2.5 Fine Particles (2.5 microns & smaller)
VOC Volatile Organic Compounds
TOXICS Toxic Air Pollutants including Carbonyls (Aldehydes), Metals & VOCs
BC Black Carbon
SPEC Speciated Fine Particles
IMPROVE Visibility PM Speciation

Draft 2024 Network Plan

See below for the Draft 2024 Network Plan, its attachments, and associated public notices.

Draft 2024 Annual Ambient Air Quality Monitoring Network Plan

2024 Attachments 2 & 3: Site Measurements & Measurement Methods

Public Notice: English | EspañolKreyòl AyisyenPortuguês | 中文中文(繁體) | ភាសាខ្មែរ

If you have questions, please direct them to:

Contact   for MassDEP Ambient Air Quality Monitoring Network & Annual Plan


MassDEP Air Assessment Branch
Sen. Wm. X. Wall Experiment Station, 37 Shattuck Street, Lawrence, MA 01843-1398

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