SmogRank / United States / New Jersey / New Brunswick

New Brunswick, month by month

New Brunswick has a measured daily mean on 1,251 days since 1 January 2023. Its worst month was June 2023, at 68 US AQI (18.2 µg/m³), 302nd of 1,603 cities on that month's world ranking. Its cleanest was March 2024, at 21 US AQI (3.8 µg/m³). 2025 averaged 35 US AQI (6.3 µg/m³), against 32 US AQI (5.8 µg/m³) in 2024.

Every month since 2023

202638 so far241 days measured2,255th of 2,798 in the world
Jan34#2,081Feb17 daysMar13 daysApr26#2,592May33#1,982Jun37#1,589Jul63#480Aug37#2,212Sep24#2,649Oct26#2,278
202535 for the year349 days measured2,291st of 2,681 in the world
Jan29#2,192Feb26#2,429Mar24#2,586Apr30#2,443May31#2,096Jun53#1,264Jul52#1,310Aug45#1,793Sep36#1,887Oct24#2,312Nov28#2,409Dec33#2,474
202432 for the year347 days measured1,823rd of 2,097 in the world
Jan21 daysFeb27#2,156Mar21#1,524Apr27#2,002May32#2,105Jun43#1,431Jul51#916Aug43#1,346Sep26#1,850Oct30#1,677Nov24#2,414Dec32#2,116
202351 for the year314 days measured621st of 1,355 in the world
Jan41#813Feb48#766Mar35#699Apr41#957May43#975Jun68#302Jul59#268Aug52#719Sep49#807Oct43#832Nov11 daysDec34#1,773
Each square is a month's mean PM2.5 in US AQI from New Brunswick's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with New Brunswick marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

4 months
MonthWhy
Mar 202613 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Feb 202617 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 202421 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Nov 202311 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

New Brunswick's worst months

MonthUS AQIDays measuredWorld rankEpisode
June 2023 6818.2 µg/m³28 of 30302ndof 1,603Eastern United States and Canada, June and July 2023
Eastern United States and Canada, May and June 2023
July 2026 6315.7 µg/m³25 of 31480thof 2,784Northern United States and Canada, July 2026
July 2023 5913.2 µg/m³25 of 31268thof 1,432North-eastern United States, 19 July 2023
Eastern United States and Canada, June and July 2023
June 2025 5310.1 µg/m³30 of 301,264thof 2,508–
July 2025 529.8 µg/m³31 of 311,310thof 2,889North-eastern United States and Canada, 29 July to 9 August 2025
North-eastern United States and Canada, 24 to 28 July 2025
August 2023 529.4 µg/m³31 of 31719thof 1,980–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

New Brunswick's worst days

DayUS AQIEpisode
8 Jun 2023 191112.0 µg/m³Eastern United States and Canada, May and June 2023
16 Jul 2026 16575.6 µg/m³Northern United States and Canada, July 2026
30 Jun 2023 15966.9 µg/m³Eastern United States and Canada, June and July 2023
18 Jul 2026 15560.5 µg/m³Northern United States and Canada, July 2026
17 Jul 2026 15358.8 µg/m³Northern United States and Canada, July 2026
29 Jun 2023 13047.3 µg/m³Eastern United States and Canada, June and July 2023
1 Jul 2023 9331.8 µg/m³Eastern United States and Canada, June and July 2023
11 Jun 2023 8628.0 µg/m³Eastern United States and Canada, May and June 2023
19 Jul 2023 8627.9 µg/m³North-eastern United States, 19 July 2023
27 Jul 2025 8527.6 µg/m³North-eastern United States and Canada, 24 to 28 July 2025

Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, New Brunswick, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/new-brunswick/history (accessed 13 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

New Brunswick now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 01:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).