Live

Hiji Air Quality Index (AQI) | Air Pollution

Real-time PM2.5, PM10 air pollution level in Oita

Last Updated: 2025-07-17 07:54:05 AM (Local Time)

Live AQI

Air Quality is

Moderate

pm10 : 22 µg/m³

PM2.5 : 10 µg/m³

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

26 °C

Last Updated: 2025-07-17 07:54:05 AM (Local Time)

Map

Hiji

Major Air Pollutants
Hiji

Particulate Matter(PM2.5)

10µg/m³

Particulate Matter(PM10)

22µg/m³

Carbon Monoxide(CO)

87ppb

Sulfur Dioxide(SO2)

3ppb

Nitrogen Dioxide(NO2)

4ppb

Ozone(O3)

26ppb

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AQI Graph

Historical Air Quality Data
Hiji

24 Hours

AQI

Hiji

AQI

16-07-2025Time17-07-2025

Time	Hiji
08 AM	52
09 AM	30
10 AM	38
11 AM	56
12 PM	53
01 PM	54
02 PM	64
03 PM	74
04 PM	72
05 PM	62
06 PM	50
07 PM	47
08 PM	54
09 PM	53
10 PM	51
11 PM	52
12 AM	50
01 AM	49
02 AM	52
03 AM	52
04 AM	52
05 AM	52
06 AM	53
07 AM	53

Min.at 9:09 AM on 16th Jul

Max.at 3:09 PM on 16th Jul

Want air quality data?

AQI Trends - Annual Air Quality Changes
Hiji, Oita, Japan

AQI

Year

AQI

AQI	AQI
Mar 2020	35
Apr 2020	34
May 2020	38
Jun 2020	40
Jul 2020	29
Aug 2020	52
Sep 2020	25
Oct 2020	29
Nov 2020	31
Dec 2020	29
Jan 2021	30
Feb 2021	36
Mar 2021	34
Apr 2021	31
May 2021	40
Jun 2021	41
Jul 2021	32
Aug 2021	28
Sep 2021	35
Oct 2021	35
Nov 2021	38
Dec 2021	32
Jan 2022	33
Feb 2022	38
Mar 2022	43
Apr 2022	41
May 2022	48
Jun 2022	39
Jul 2022	37
Aug 2022	35
Sep 2022	35
Oct 2022	35
Nov 2022	39
Dec 2022	33
Jan 2023	38
Feb 2023	37
Mar 2023	43
Apr 2023	47
May 2023	43
Jun 2023	43
Jul 2023	37
Aug 2023	29
Sep 2023	37
Oct 2023	42
Nov 2023	41
Dec 2023	37
Jan 2024	36
Feb 2024	34
Mar 2024	38
Apr 2024	44
May 2024	42
Jun 2024	37
Jul 2024	33
Aug 2024	37
Sep 2024	35
Oct 2024	33
Nov 2024	36
Dec 2024	32
Jan 2025	41
Feb 2025	37
Mar 2025	47
Apr 2025	43
May 2025	40
Jun 2025	45
Jul 2025	66

Annual AQI Trends

2020

34AQI

2021

34AQI

No Change

2022

38AQI

12%

Rise

2023

40AQI

Rise

2024

36AQI

-10%

Fall

2025

44AQI

22%

Rise

Overall Annual Percentage (%) change of AQI in (2020 to 2025)

Rise (Worsened AQI)

Most & Least Polluted Months

Most PollutedJuly, 202566AQI

Least PollutedSeptember, 202025AQI

* This data analysis is from year 2020 - 2025

Hiji's Locations
Real-time Air Pollution Level

Location

Status

AQI

PM2.5(µg/m³)

PM10(µg/m³)

Temp.(°C)

Humi.(%)

Hayami District

Moderate

Japan's Metro Cities
Air Quality Index

Aomori

Higashi Hiroshima

Higashi Osaka

Kyoto

Saitama

Sendai

Tokyo

Yokohama

Air Quality Calendar 2025
Hiji

2025

AQI

January

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
29 Dec -	30 Dec -	31 Dec -	1 Jan 32	2 Jan 34	3 Jan 33	4 Jan 31
5 Jan 34	6 Jan 41	7 Jan 32	8 Jan 38	9 Jan 28	10 Jan 31	11 Jan 29
12 Jan 35	13 Jan 40	14 Jan 40	15 Jan 42	16 Jan 36	17 Jan 41	18 Jan 37
19 Jan 41	20 Jan 41	21 Jan 59	22 Jan 65	23 Jan 74	24 Jan 73	25 Jan 46
26 Jan 45	27 Jan 35	28 Jan 37	29 Jan 32	30 Jan 34	31 Jan 42	1 Feb 49

February

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
26 Jan 45	27 Jan 35	28 Jan 37	29 Jan 32	30 Jan 34	31 Jan 42	1 Feb 49
2 Feb 35	3 Feb 44	4 Feb 31	5 Feb 36	6 Feb 30	7 Feb 32	8 Feb 30
9 Feb 29	10 Feb 31	11 Feb 36	12 Feb 31	13 Feb 31	14 Feb 36	15 Feb 32
16 Feb 39	17 Feb 38	18 Feb 35	19 Feb 35	20 Feb 33	21 Feb 34	22 Feb 36
23 Feb 36	24 Feb 35	25 Feb 36	26 Feb 43	27 Feb 62	28 Feb 55	1 Mar 81

March

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
23 Feb 36	24 Feb 35	25 Feb 36	26 Feb 43	27 Feb 62	28 Feb 55	1 Mar 81
2 Mar 68	3 Mar 48	4 Mar 39	5 Mar 35	6 Mar 37	7 Mar 33	8 Mar 39
9 Mar 40	10 Mar 44	11 Mar 44	12 Mar 47	13 Mar 51	14 Mar 36	15 Mar 35
16 Mar 23	17 Mar 41	18 Mar 34	19 Mar 37	20 Mar 43	21 Mar 52	22 Mar 56
23 Mar 59	24 Mar 51	25 Mar 70	26 Mar 66	27 Mar 61	28 Mar 60	29 Mar 52
30 Mar 41	31 Mar 34	1 Apr 39	2 Apr 35	3 Apr 31	4 Apr 31	5 Apr 41

April

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
30 Mar 41	31 Mar 34	1 Apr 39	2 Apr 35	3 Apr 31	4 Apr 31	5 Apr 41
6 Apr 41	7 Apr 37	8 Apr 34	9 Apr 52	10 Apr 50	11 Apr 52	12 Apr 53
13 Apr 43	14 Apr 48	15 Apr 29	16 Apr 42	17 Apr 43	18 Apr 53	19 Apr 54
20 Apr 45	21 Apr 44	22 Apr 36	23 Apr 28	24 Apr 37	25 Apr 53	26 Apr 46
27 Apr 55	28 Apr 41	29 Apr 46	30 Apr 47	1 May 46	2 May 38	3 May 41

May

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
27 Apr 55	28 Apr 41	29 Apr 46	30 Apr 47	1 May 46	2 May 38	3 May 41
4 May 36	5 May 37	6 May 31	7 May 31	8 May 36	9 May 30	10 May 34
11 May 33	12 May 48	13 May 53	14 May 57	15 May 55	16 May 51	17 May 38
18 May 48	19 May 54	20 May 57	21 May 37	22 May 44	23 May 40	24 May 32
25 May 29	26 May 31	27 May 36	28 May 42	29 May 38	30 May 35	31 May 37

June

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
1 Jun 45	2 Jun 49	3 Jun 29	4 Jun 41	5 Jun 35	6 Jun 54	7 Jun 55
8 Jun 61	9 Jun 37	10 Jun 35	11 Jun 46	12 Jun 44	13 Jun 43	14 Jun 34
15 Jun 32	16 Jun 29	17 Jun 37	18 Jun 39	19 Jun 42	20 Jun 50	21 Jun 55
22 Jun 69	23 Jun 45	24 Jun 45	25 Jun 46	26 Jun 46	27 Jun 52	28 Jun 48
29 Jun 48	30 Jun 54	1 Jul 58	2 Jul 73	3 Jul 89	4 Jul 94	5 Jul 90

July

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
29 Jun 48	30 Jun 54	1 Jul 58	2 Jul 73	3 Jul 89	4 Jul 94	5 Jul 90
6 Jul 70	7 Jul 61	8 Jul 68	9 Jul 75	10 Jul 76	11 Jul 49	12 Jul 49
13 Jul 41	14 Jul 39	15 Jul 51	16 Jul -	17 Jul -	18 Jul -	19 Jul -
20 Jul -	21 Jul -	22 Jul -	23 Jul -	24 Jul -	25 Jul -	26 Jul -
27 Jul -	28 Jul -	29 Jul -	30 Jul -	31 Jul -	1 Aug -	2 Aug -

Health Advice For People Living In
Hiji

0Cigarettes per day

Weekly 0 Cigarettes

Monthly 0 Cigarettes

Breathe easy and get active! The air quality is perfect for enjoying outdoor activities.

Source:

Berkeley Earth

Solutions for Current AQI

Air PurifierTurn On
Car FilterMust
N95 MaskMust
Stay IndoorMust

Must turn on the air purifier to enjoy fresh air.

Get an Air Purifier

Prevent Health Problems: Understand Your Risks

Hiji

Asthma
Heart Issues
Allergies
Sinus
Cold/Flu
Chronic (COPD)

Mid. Chances of Asthma

Asthma

Risk of Asthma symptoms is Mid. when AQI is Moderate (50-150)

Moderate symptoms including frequent wheezing, noticeable shortness of breath, chest tightness, and persistent cough.

Do's :

Limit outdoor activities when AQI is poor.
Clean indoor air with an air purifier to reduce exposure.
Soothe the respiratory tract with herbal teas or warm water to help alleviate symptoms.

Don'ts :

Exercise outdoors without a mask.
Stay in smoky areas with strong fumes.

Most Polluted Cities 2025
Japan

Analyze the real-time most air polluted cities in the country.

Most Polluted Cities Live Ranking 2025

World's Most PollutedCity Rankings (2024)

World's Most PollutedCountry Rankings(2024)

RankCityAQIAQI Status

Standard Value

Imabari, Japan

Aioi, Japan

Tokushima, Japan

Okayama, Japan

Matsuyama, Japan

Komatsushimacho, Japan

Moderate

4xabove Standard

Narutocho Mitsuishi, Japan

Saijo, Japan

Kariya, Japan

10.

Yamazaki, Japan

Moderate

4xabove Standard

Last Updated: 16 Jul 2025, 10:58 PM

AQI City Rankings

Air Quality Solutions For Hiji
Explore the solutions of air quality monitoring & clean air.

Here are some applications that you can go through to find out the solutions.

Air Quality Monitor

Monitor the air quality

Air Quality Sensors

Sensors to measure the air quality

Fresh Air Machine

Clean the air you breathe

Car Cabin Filter

Purify the air in your car

N95 Mask

Shield yourself from pollution

air quality solutions for offices for Hiji

Air Quality Solution For Offices

A complete solution for air quality monitoring, data analysis, and fresh air solutions in workplaces prioritizing employee's health and productivity.

Air Quality Solutions For Smart City

Prana Air smart city project provides air quality monitors, drones, outdoor air purifiers, and data dashboards solution to improve air quality.

air quality solutions for institutes for Hiji

Air Quality Solutions for Schools | Institutes

Prana Air provides the air quality solutions for schools by air monitoring & fresh air machine that help the students to breather clean air.

Air Quality Solutions For Hotels

Prana Air air quality solutions are suited for hotel businesses. The occupancy of hotels is the main reasons for bad air quality.

Air Quality Solutions for Restaurants

Prana Air has the air quality solutions for restaurant, cafes, and gives you the power to know what your customers and staff breathe.

Air Quality Solutions for RMC Plants

Prana Air provides air quality monitoring solutions for RMC plants. Improve compliance, protect workers and community, and reduce emissions.

Air Quality Solutions for Fitness Center

Prana Air provides the air quality solutions of pollution monitoring and fresh air for fitness center - gym.

Air Quality Solutions for Parking Lot

A complete solution for air monitoring, data analysis, and fresh air solutions for enclosed car parking areas and car lots.

Air Quality Solutions for Retail Stores

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets.

air quality solutions for airport for Hiji

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets

Prana Air provides the air quality solutions for airport. Gathering of many passengers is the main reasons of bad air quality in airport.

Air Quality Solutions For Construction Sites

Prana Air offers air quality monitoring solutions for construction sites with data cloud storage, web-dashboard, mobile apps, TV display.

Air Quality Solutions For Hospitals

Prana Air provides air quality monitoring and fresh air solutions for hospitals to ensure clean and healthy indoor air.

air quality solutions for bathroom for Hiji

Air Quality Solutions For Washroom | Bathroom

Improve washroom and bathroom air quality with Prana Air air quality monitoring devices and fresh air machine. Breathe easy and stay healthy.

Air Quality Solutions for Banks

Prana Air provides air quality solutions of pollution monitoring and fresh air for banks and financial institutions.

Air Quality Solutions for Cinema

Air quality solutions for cinema halls or theatres will help the customers to get the good experience, comfort and breathe clean air.

Air Quality Solutions For Real Estates

Prana Air provides the air quality solutions of pollution monitoring and fresh air for real estates - residential and commercial.

Hiji's AQI Data Analytics Solutions
Air quality data monitoring platforms

Mobile App

Smart TV App

Web Dashboard

API

Widgets

Mobile App

Empower Your Decisions with Reliable Data

Get it onApp Store

Get it onGoogle Play

Your area’s real-time data with detailed parameters.

Personalized health advice as per current AQI.

Analytical data to identify trends and conditions.

Connect and control your air quality devices.

Air Quality FAQs
at Hiji

Frequently Asked Questions About Air Quality

What is the current AQI level in Hiji?

The current real-time AQI level in Hiji is 53 (Moderate). This was last updated 2025-07-17 07:54:05 AM (Local Time).

When was the best AQI level in Hiji in the last 24 hours?

The best AQI level was 30 (Good) at 9:09 AM (Local Time) during the last 24 hours.

When was the worst AQI level in Hiji in the last 24 hours?

The worst AQI level was 74 (Moderate) at 3:09 PM (Local Time) during the last 24 hours.

What is the current trend of AQI levels in Hiji during last 24 hours?

The AQI levels in Hiji have been fluctuating throughout the last 24 hours. The levels have increased by highest 74 at 3:09 PM (Local Time), lowest 30 at 9:09 AM (Local Time).

What actions are recommended as per the current AQI level in Hiji?

Current AQI levels are acceptable; however, some pollutants may be a concern for a small number of sensitive individuals.