Protecting Delaware City's Air Quality — In Real Time

Ordered by Delaware DNREC, this public monitoring system provides continuous fence-line VOC readings from sensors stationed around the Delaware City Refinery. Free access for all community members.

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Normal < 500 ppb

Caution 500–730 ppb

Alert > 730 ppb

Why This System Exists

Community Transparency After a Major Release

On November 26–27, 2025, a malfunction at the Delaware City Refinery released approximately 108.75 tons of volatile organic compounds (VOCs) — primarily butane — into the surrounding community. In response, the Delaware Department of Natural Resources and Environmental Control (DNREC) issued Consent Order 2025-A-0038, requiring Delaware City Refining Company to install and maintain a real-time fence-line monitoring system.

This platform is the public-facing component of that system. It provides 24/7 access to live air quality data so residents, regulators, and community organizations can independently verify conditions around the facility.

108.75 tons

VOCs released

Nov 26–27, 2025

Incident dates

2025-A-0038

DNREC Consent Order

360°

Perimeter coverage

How It Works

Continuous Monitoring, From Sensor to Screen

Continuous Monitoring

Five sensor stations positioned around the refinery perimeter measure non-methane hydrocarbon (NMHC) levels every 5 minutes, 24 hours a day.

Data Analysis

Readings are processed with 5-minute and 1-hour averaging periods. Meteorological data including wind speed and direction is captured alongside each reading.

Public Alerts

When VOC levels exceed 730 ppb, the system automatically sends email alerts to subscribers. Daily, weekly, and monthly reports are generated for the public record.

Features

What You Get With a Free Account

Interactive Map

Color-coded sensor markers on a satellite map showing real-time VOC levels at each station. Green (< 500 ppb), yellow (500–730 ppb), or red (> 730 ppb) at a glance.

Real-Time Dashboard

Live readings with 5-minute and 1-hour averaging for every station. Track current conditions, see trend arrows, and monitor wind data — all in one view.

Instant Alerts

Automatic email notifications when VOC levels exceed 730 ppb or when a sensor goes offline. Smart deduplication so you only get notified when it matters.

Reports & History

Historical trend charts with 24-hour, 7-day, and 30-day views. Automated PDF reports generated daily, weekly, and monthly — downloadable anytime.

Stay Informed

Notifications That Matter

Choose which alerts you receive. All notifications are delivered by email.

VOC Exceedance

Immediate alert when any station reads above 730 ppb NMHC — the regulatory action threshold.

Instrument Outage

Get notified when a sensor station goes offline or stops reporting, so you know if there's a gap in coverage.

Report Available

Notification when a new daily, weekly, or monthly report has been generated and is ready for download.

Stay Informed About Your Air Quality

Create a free account to access live sensor data, set up personalized alerts, and download automated reports.

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