Beijing, China Air Quality & Smog

Dominant pollutants, when pollution and smog are worst, a notable historical episode, and the official monitoring agencies for Beijing, China — plus how to check the current reading. Beijing reports air quality on the China Air Quality Index — our full guide explains how that scale works and how it compares to the US AQI.

Dominant pollutants

PM2.5, spring dust (PM10), winter coal/heating pollution.

Seasonal pattern: when smog is worst

Beijing became the global symbol of severe urban air pollution in the early 2010s. Aggressive controls since 2013 — coal restrictions, vehicle limits, factory relocations — have cut PM2.5 substantially, but winter heating-season episodes still occur, and spring brings Asian dust from the northern deserts. China reports a 0–500 AQI broadly similar in structure to the US scale.

A notable air-quality episode

In January 2013, the "Airpocalypse" pushed PM2.5 off the measurable scale — readings near 900 µg/m³ at one monitor — and helped trigger China's national "war on pollution." Air quality has improved markedly since, though winter spikes persist.

The local index and who runs it

Beijing reports air quality using the China Air Quality Index, not the US AQI — so the same air can read as a different number than you may be used to. The Beijing monitoring center and the national MEE publish the China AQI and station-level PM2.5; see our overview of world air-quality indices for how China's scale compares.

• Beijing Municipal Ecological and Environmental Monitoring Center
• China Ministry of Ecology and Environment (MEE)

How to check air quality in Beijing

For the official live reading, the agency portals above are the canonical source. To understand what the numbers mean, start with our guide to the China Air Quality Index and the broader comparison of world air-quality indices. Smog Report puts glanceable air quality on your iPhone — widgets, Live Activities, Siri, and Apple Watch — free and with no account.

Common questions about Beijing air quality

Why does Beijing have air-quality and smog problems?

Beijing became the global symbol of severe urban air pollution in the early 2010s. Aggressive controls since 2013 — coal restrictions, vehicle limits, factory relocations — have cut PM2.5 substantially, but winter heating-season episodes still occur, and spring brings Asian dust from the northern deserts. China reports a 0–500 AQI broadly similar in structure to the US scale.

What are the main air pollutants in Beijing?

Beijing's dominant pollutants are PM2.5, spring dust (PM10), winter coal/heating pollution. The reading on any given day is usually driven by whichever of these is highest.

Has Beijing had a major air-quality or smog event?

In January 2013, the "Airpocalypse" pushed PM2.5 off the measurable scale — readings near 900 µg/m³ at one monitor — and helped trigger China's national "war on pollution." Air quality has improved markedly since, though winter spikes persist.

What air-quality index does Beijing use?

Beijing reports air quality on the China Air Quality Index (AQI), not the US AQI — so the same air can read as a different number than you may be used to. For live, glanceable readings on your iPhone, the free Smog Report app auto-selects the right local index for wherever you are.

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