◆ Making heatstroke prevention more accessible and accurate: With the enforcement of the revised Industrial Safety and Health Regulations in June 2025, heatstroke prevention measures in the workplace have become mandatory. "Weather Heat Index Monitor WBGT Simple" (free & ad-free) enables advanced heat index (WBGT) management with just a smartphone, without the need for expensive measuring instruments.

https://www.lpd-lab.com/weather-wbgt/heatstroke-prevention-mandatory-related/

【1. Four major features of this app】
(1) No dedicated equipment required: There's no need to carry bulky measuring instruments with black globes.
(2) Supports 200,000 locations worldwide: In addition to 1400 locations in Japan, it supports weather data from around the world.
(3) Estimation of outdoor heat index considering wind speed: It reflects the effect of wind speed, which was difficult with conventional measuring instruments, and calculates more practical values.

(4) Adoption of a Semi-Physical Model: Unlike statistical models specific to Japan, this app incorporates an estimation algorithm based on physical laws. It maintains accuracy even overseas.

[2. How can it determine the outdoor heat index without a black globe?] This app estimates solar radiation using a physical model that combines the solar constant, latitude and longitude, cloud cover, and meteorological parameters (temperature, humidity, etc.). This enables precise simulation using only a smartphone, without the need for a black globe (black sphere) to measure heat from solar radiation.

https://www.lpd-lab.com/weather-wbgt/estimation-model/

[3. How can it support over 200,000 locations worldwide and over 1,400 locations in Japan?] While statistical models, such as the well-established Ono-Tonouchi model, are based on statistical processing of "past data from specific weather stations in Japan," this estimation model uses algorithms based on Stull's equation, Okada and Kusaka's equation, and the physical estimation of solar radiation. Its strength lies in its ability to accurately derive the Wet Bulb Globe Temperature (WBGT) index from real-time online weather data using only a smartphone and this app. This enables the estimation of outdoor and indoor WBGT values for over 1400 locations in Japan and over 200,000 locations worldwide, something impossible with conventional statistical models. Comparison of estimated values from both models can be performed using the graphing function of the following Windows freeware:

https://www.lpd-lab.com/weather-wbgt/download/

[4. Why is considering wind speed important?] Many conventional heat index meters do not evaluate the cooling effect of wind speed. This app can estimate the outdoor heat index reflecting the influence of wind speed from online weather data.

[5. System Requirements] OS: Android 8.0 or later

[6. Easy 3-Step Usage]
(1) Initial Setup: Launch the app and register your free OpenWeather API key according to the manual linked on the settings page.

(2) Location Setting: Enter the "City Name" for which you want to check the heat index.

(3) Monitoring: The estimated WBGT values for outdoor and indoor locations will be displayed in real time.

Please see the following link for a detailed manual:

https://www.lpd-lab.com/weather-wbgt/weather-heat-index-monitor-manual/

[7. OpenWeather Free API Key Registration] To obtain the latest weather data with this app, you need to register for OpenWeather (weather information service) for free. The registration method is explained clearly with images at the following URL:

https://www.lpd-lab.com/weather-wbgt/openweather-registration-method/

[8. Privacy and Location Information] This app respects user privacy.

- No automatic location information acquisition: Automatic collection of your current location via GPS, etc., is not performed.

- Use of City Name Only: Only the "City Name" set by the user is used to obtain weather information.

For details, please see the Privacy Policy.

https://www.lpd-lab.com/weather-wbgt/privacypolicy/

[9. Regarding the Acquisition of Weather Data] The weather information displayed in this application utilizes the API provided by OpenWeather.
•Weather data provided by OpenWeather (https://openweathermap.org/)
•Data is licensed under the Open Database License (ODbL).
The software developer is not responsible for the accuracy or delay of the weather data. Details are subject to OpenWeather's terms of service.

[10. Disclaimer]
• The WBGT values calculated by this application are estimated values. Please use them as reference values for heatstroke prevention and as an aid in on-site safety decisions.
• Final decisions regarding medical and safety judgments should always be made using specialized measuring equipment.
• The developer assumes no responsibility for any damages resulting from the use of this application.

[11. [Development Background and Acknowledgments] This project is a new endeavor that combines LP&D LABORATORY's scientific expertise with the latest AI technology. We collaborated with Google's AI model "Gemini" as a development partner to develop a WBGT (Wet Bulb Globe Temperature) estimation model (Watanabe-Gemini Model 1) and application. We express our sincere gratitude for the significant technical cooperation we received in object-oriented design advice and in constructing the heat index estimation logic using weather data.

[12. Contact Us] For comments, requests, or bug reports, please visit the following website:

https://www.lpd-lab.com/weather-wbgt/contact-us/

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