traffic figureWhat the air says about the roads

อากาศบอกอะไรเรื่องถนน

In the haze, burning is four times the traffic. Out of it, traffic is three quarters of what you breathe.

Panorama of the city of Chiang Mai, part of the surrounding valley and the mountains east of the city of Chiang Mai. The photo was made from the viewpoint halfway up the road towards Wat Phrathat Doi

76%traffic's share of PM2.5 outside the haze season, one study

2024year

How it was counted. Abstract only; the full paper was not fetched. Marked as such.

What it is

A 2024 source-apportionment study, seen only in its abstract: in the smoke-haze period biomass burning contributed 59.3 µg/m³ of PM2.5 and traffic 14.6; outside it traffic contributed 27.2 and biomass 2.5, traffic being about 76 percent of the total. Days over the standard at the Yupparaj school station: 43 in 2022, 101 in 2023, 80 in 2024. A 2026 emissions inventory puts the province's biomass-burning PM2.5 at 70,179 tonnes for January to April 2024, a quarter of the north's. In April 2026 the city ranked second worst in the world for a day and disaster zones were declared.

The long version

Inference — eight months a year the road is the air. The plans on this site are judged on congestion; none of them is costed on breath.

Connected to

How slow: the TomTom index The other seasonal number.

The Mae Hong Son Loop — the air page, 15,050 point-days of PM2.5 by month

Where each claim comes from

Field	Tier	Source	Note
default	cited	Source apportionment of PM2.5 in Chiang Mai — Atmospheric Environment 2024 — Elsevier
text_th	inference		written in Thai by this project, in the northern register where it fits; not machine-translated
text.story	inference

Sources

Source apportionment of PM2.5 in Chiang Mai — Atmospheric Environment 2024 — Elsevier
Chiang Mai smoke: days over standard — Prachatai English
Biomass-burning PM2.5 emissions, northern Thailand, Jan–Apr 2024 — Chotamonsak et al., Toxics 14(1):84 — MDPI
2026 Chiang Mai smog — Wikipedia (en)
Chiang Mai air quality — annual PM2.5 — IQAir

cited Cited — a named source, linked · harvested Harvested — fetched from an open dataset, with its licence · tradition Tradition — general knowledge of the tradition, hedged · inference Inference — this project's own reasoning from the above · field Field — someone stood there

This record as JSON