SmogRank / Japan / Yamanashi / Uenohara

Uenohara, month by month

Uenohara has a measured daily mean on 269 days since 10 January 2026. Its worst month was July 2026, at 55 US AQI (11.4 µg/m³), 1,021st of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 21 US AQI (3.7 µg/m³).

Every month since 2026

202640 so far269 days measured2,188th of 2,798 in the world

Jan18 daysFeb37#2,298 Mar42#2,255 Apr41#1,785 May44#1,306 Jun34#1,850 Jul55#1,021 Aug41#1,948 Sep21#2,825 Oct34#1,863

Each square is a month's mean PM2.5 in US AQI from Uenohara'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 Uenohara marked; each year, the year's. A dashed square is the running month, so far.

Good0–50

Moderate51–100

Unhealthy for 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

1 month

Month	Why
Jan 2026	18 of 31 days measured; a month needs 22. The others: 4 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.

Uenohara's worst months

Month	US AQI	Days measured	World rank
July 2026	5511.4 µg/m³	29 of 31	1,021stof 2,784
May 2026	448.0 µg/m³	30 of 31	1,306thof 2,874
March 2026	427.5 µg/m³	31 of 31	2,255thof 2,971
April 2026	417.4 µg/m³	30 of 30	1,785thof 2,941
August 2026	417.3 µg/m³	31 of 31	1,948thof 2,896
February 2026	376.7 µg/m³	28 of 28	2,298thof 2,866

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.

Uenohara's worst days

Day	US AQI
23 Jul 2026	7823.6 µg/m³
16 Jul 2026	7421.7 µg/m³
22 Jul 2026	7120.1 µg/m³
24 Jul 2026	7019.5 µg/m³
17 Jul 2026	6717.7 µg/m³
1 Aug 2026	6717.7 µg/m³
17 Jan 2026	6717.6 µg/m³
1 Jul 2026	6717.6 µg/m³
15 Jul 2026	6516.4 µg/m³
30 Mar 2026	6315.8 µg/m³

Daily means, the highest since 10 Jan 2026; 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, Uenohara, Japan, 10 Jan 2026 – 12 Oct 2026. Monitor data from Ministry of the Environment Air Pollutant Wide Area Monitoring System via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/jp/uenohara/history (accessed 13 Oct 2026).

Download chart (PNG)

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.

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

Updated 2026-10-13 03:07 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).