AQI World

Tianjin Air Quality Index (AQI) & Pollution Guide

Tianjin — China's fourth largest city and the country's largest northern port — sits 130km southeast of Beijing on the Bohai Sea. The city's massive industrial base in steel, petrochemicals, and manufacturing makes it one of China's most challenging air quality cases, sharing the notorious North China Plain pollution belt with Beijing, Hebei, and Shandong provinces.

138
Annual Avg AQI
Unhealthy for Sensitive
48 μg/m³
Annual PM2.5
9.6× WHO guideline
August
Best Month
AQI 58 (summer)
January
Worst Month
AQI 198 (coal heating)

The North China Plain Pollution Belt: Why Tianjin Can't Go It Alone

Tianjin's air quality is inseparable from the broader North China Plain airshed. Beijing, Tianjin, and Hebei province (the "Jing-Jin-Ji" region) share one of the world's most heavily industrialized and populated corridors. Pollution generated in Hebei's steel belt (Tangshan, Handan) regularly blankets Tianjin regardless of local controls.

The flat topography of the North China Plain means there are no natural barriers to prevent regional pollution mixing. Unlike cities in river valleys or mountain basins, Tianjin's pollution challenge is partly beyond local control. Regional coordination through the "2+26 city" coordinated control mechanism — covering Beijing, Tianjin, and 26 surrounding cities in Hebei, Shandong, Shanxi, and Henan — has been the primary policy response since 2017.

The Bohai Sea coastline provides some easterly wind relief during summer, when sea breezes ventilate the city on clear days. This maritime influence is why Tianjin's summer AQI (65–75) is meaningfully better than inland cities at the same latitude.

Monthly AQI Pattern — Tianjin

MonthAQILevelNote
Jan198
Coal heating peak, stable air
Feb178
Severe pollution, inversions
Mar142
Improving, spring winds
Apr118
Sand/dust storms from Gobi
May95
Pre-summer improvement
Jun78
Humid, ozone season starts
Jul65
Monsoon rain cleansing
Aug58
Best summer air
Sep72
Post-monsoon dry
Oct112
Heating starts, smog onset
Nov162
Heavy pollution season
Dec185
Winter heating maximum

Tianjin's Pollution Sources

⚙️

Steel Industry (25–30% of PM2.5)

Tianjin's Binhai New Area hosts major steel producers with over 100 million tonnes/year combined capacity. Electric arc furnaces and sintering operations generate fine particulate matter. China's mandatory ultra-low emission retrofits are being applied, but older plants remain.

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Petrochemicals & Refining (15–20%)

The Tianjin Economic-Technological Development Area (TEDA) and Binhai New Area house PetroChina and Sinopec refineries, chemical plants, and polymer facilities. Stack emissions contribute NOx, SO₂, and fine aerosols to the urban air shed.

🚢

Port & Shipping (8–12%)

Tianjin Port is China's 4th largest container terminal (20+ million TEU/year). Ship exhaust from container vessels, bulk carriers, and oil tankers produces sulfur dioxide and fine diesel particles. China implemented a domestic emission control area (DECA) in 2019, requiring low-sulfur bunker fuel, reducing this contribution.

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Coal Heating (20–25% in winter)

District heating systems serving Tianjin's 14 million residents burn significant coal volumes, peaking when the heating season switches on November 15. Since 2017, many residential coal boilers in urban Tianjin have been converted to gas or heat pumps, but the surrounding Hebei coal emissions still impact the city.

🚗

Vehicles & Transport (15%)

14+ million registered vehicles, plus heavy truck traffic serving the port. Tianjin implemented license plate restrictions and diesel truck exclusion zones, but the large vehicle fleet remains a major NOx source driving ozone formation.

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Construction & Dust (8%)

Tianjin's ongoing rapid urbanization and coastal reclamation projects generate significant construction dust. The Binhai New Area — a massive greenfield industrial/residential development — has been under continuous construction since the 2000s.

Pollutant Levels vs WHO Guidelines

PollutantTianjin AnnualWHO GuidelineExceedanceMain Source
PM2.548 μg/m³5 μg/m³9.6×Industrial + coal heating
PM1085 μg/m³15 μg/m³5.7×Construction, port, road
NO₂52 μg/m³10 μg/m³5.2×Steel, vehicles, power
SO₂28 μg/m³40 μg/m³0.7×Improving with desulfurization
O₃Moderate–High60 μg/m³—Summer afternoons
COModerate4 mg/m³ (8hr)—Industrial processes

China Major City Air Quality Comparison

CityPM2.5 (μg/m³)Annual AQIContext
Harbin52148Extreme winter coal heating
Tianjin48138📍 Industrial port city
Beijing35102Post-Action Plan improvement
Zhengzhou42122North China Plain
Shanghai2882Yangtze delta, improving
Chengdu38112Sichuan Basin trap
Guangzhou2268Tropical, better air
Shenzhen1855SEZ, strictest standards

Frequently Asked Questions

How bad is Tianjin's air quality compared to Beijing?
Tianjin's annual average PM2.5 is approximately 48 μg/m³, roughly 35% higher than Beijing's 35 μg/m³. Both cities share the North China Plain airshed and suffer similar winter stagnation events, but Tianjin's heavier industrial base (steel, petrochemicals, manufacturing) contributes significantly more industrial emissions. However, Beijing often receives more media attention due to its capital status.
What industries drive Tianjin's air pollution?
Tianjin's pollution has three industrial pillars: (1) Steel — the city has 100+ million tonnes of annual steel capacity, concentrated in the Binhai district. (2) Petrochemicals — Tianjin's Binhai New Area hosts refineries and chemical plants along the Bohai Sea coastline. (3) Manufacturing — automotive, electronics, and machinery production contributes NOx and VOC emissions. The port itself (Tianjin is China's 4th largest container port) generates diesel particulate matter from ships and trucks.
Has Tianjin's air quality improved in recent years?
Yes. Tianjin has made measurable progress under China's Air Pollution Action Plans. SO₂ emissions fell over 60% since 2013 as coal desulfurization became mandatory. PM2.5 dropped from estimated 80+ μg/m³ in 2013 to around 48 μg/m³ today — roughly a 40% reduction. The city transitioned thousands of industrial boilers from coal to gas. However, the remaining 40% reduction needed to meet China's own standards (35 μg/m³ annual PM2.5) is harder to achieve.
When is Tianjin's worst air quality season?
November through February is peak pollution season. The North China Plain atmospheric pattern creates stable, low-wind conditions during winter. Coal-fired district heating systems (which switch on November 15 each year across northern China) dramatically increase emissions overnight. January averages AQI 198 (Unhealthy), with frequent very unhealthy days (AQI 200–300).
Is Tianjin safe to visit?
Tianjin is generally safe to visit, but air quality should be considered for any stay longer than a day or two. The summer months (July–August) offer the best air, with AQI averaging 58–65. For winter visits, N95 masks are recommended on AQI >150 days. The IQAir and Tianjin Environment Bureau websites provide real-time monitoring data to plan outdoor activities.

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