Measurement of PM2.5 and Other Air Pollutants at the Embassy of Japan in India (New Delhi)

As part of a joint research project that started in April 2022, the National Institute for Environmental Studies (NIES) and the Aryabhatta Research Institute of Observational Sciences (ARIES) are conducting observations of the ambient concentrations of several air pollutants such as PM2.5 on the rooftop of the Embassy of Japan in India. The observations were started in December 2022 and the concentration data are available on this website.

Observation Location (Latitude: 28.5901, Longitude: 77.1884)

Some Key Information:

Real-Time Data

Select the compound(s) you want to view.

Time series plots

About time series plots

You can see the following latest plots for each compound of greenhouse gases and air pollutants observed at the Embassy of Japan in India (New Delhi).

  • Daily mean concentrations for all observation periods compared with the long-term trends (Trend Analysis, cutoff frequency: 50 days period, 2 years period)
  • Daily mean concentrations in the past 365 days compared with the previous year's level (Trend Analysis, cutoff frequency: 50 days period)
  • Hourly mean concentrations in the past 365, 30, and 7 days
  • The time is in Indian Standard Time (IST), with a time difference of –3.5 hours from Japan. For hourly values, for example, the 12 O'clock data represents the average value from 12:00 to 12:59.

Daily mean values for all observation periods

Here you can download the daily mean values for all observation periods.
Time range Daily mean value

About daily mean values for all observation periods

The data available from here are not fully quality-controlled and contain outliers. The data for the short-lived component will be replaced with more accurate data in the near future.

Mean concentrations

About mean concentrations

You can see the latest data of 1-day mean, 7-day mean, 30-day mean, and 365-day mean values calculated from 1-hour values for PM2.5 and other air pollutants observed at the Embassy of Japan in India (New Delhi)

Mean 1-Day 7-Days 30-Days 365-Days Last Updated

Comparison with PM2.5 Measurement Data at the U.S. Embassy in India

Measurement Data at the U.S. Embassy in India

Source : AirNow Department of State
AirNow DOS, in collaboration between the U.S. Department of State and the U.S. Environmental Protection Agency, collects Air Quality Monitoring data from U.S. embassies and consulates around the world to inform U.S. personnel and citizens overseas.

PM 2.5 in the past 365 days (hourly)

PM 2.5 (hourly) in the past 365 days at ind_jpn-emb station

PM 2.5 in the past 30 days (hourly)

PM 2.5 (hourly) in the past 30 days at ind_jpn-emb station

PM 2.5 in the past 7 days (hourly)

PM 2.5 (hourly) in the past 7 days at ind_jpn-emb station

Technical Information

Brief Background of The Sensor Development and Details of PM2.5 Measurements

PM2.5 measurements are conducted using a sensor developed by Prof. Yutaka Matsumi, Emeritus Professor at Nagoya University (Institute for Space-Earth Environmental Research) and Dr. Tomoki Nakayama, Associate Professor at Nagasaki University (Faculty of Environmental Science), in collaboration with Panasonic Life Solutions (formerly Panasonic Eco Solutions). This PM2.5 sensor is compact and consumes low power, making it relatively easy to use in locations where infrastructure is unstable. For more detailed information, please refer to the references below.

References

Tomoki Nakayama, Yutaka Matsumi, Keiko Kawahito & Yoshifumi Watabe (2018) Development and evaluation of a palm-sized optical PM2.5 sensor, Aerosol Science and Technology, 52:1, 2-12, DOI: 10.1080/02786826.2017.1375078

The Details of O3 Measurements

Ozone (O3) concentrations are calculated using measurement data obtained from AlphaSense's OX sensor (OOX-B431) and NO2 sensor (NO2-B43F). Since the OX sensor is sensitive to both ozone and nitrogen dioxide (NO2), the ozone concentration is derived by taking the difference between the readings of the OX sensor and the NO2 sensor. (Reference: AlphaSense Japan website)

Data Policy - Please Read Carefully

- Measurement Sensors:

The sensors used for the observations are commonly known as 'compact sensors' or 'low-cost sensors,' which differ from the official PM2.5 measurement methods employed by the Ministry of the Environment, Japan, for their continuous air pollution monitoring program. While we thoroughly evaluate the fundamental nature and basic performance of the sensor, and always validate and scrutinize the data, it is important to note that the method is not the national official method for the regulations nor equivalent to that.

- Data:

The data provided on this website may sometimes exhibit abnormal values due to the sensor malfunctions, insufficient power supply, and any other incidents. The data presented here are preliminary values and are subject to post-verification and scrutiny processes, which may result in data revisions.

- Copyright Notice:

The contents on this website are protected by copyright owned by the National Institute for Environmental Studies (NIES) and the Aryabhatta Research Institute of Observational Sciences (ARIES). When using figures or data from this website, please refer to and cite this website accordingly.

- Use of AirNow Data:

Acknowledgement : AirNow, U.S. Environmental Protection Agency
The AirNow data are not fully verified and validated through the quality assurance procedures monitoring organizations use to officially submit and certify data on the EPA AQS (Air Quality System) and, therefore, cannot be used to formulate or support regulation, guidance or any other Agency decision or position.