Smoke drifting south from wildfires burning in western Ontario pushed parts of New York City into the “Unhealthy” category on the Air Quality Index (AQI) Wednesday, July 15, as New York Governor Kathy Hochul warned that wildfire smoke combined with dangerous heat would create hazardous conditions across the state. The New York State Department of Environmental Conservation (DEC) expanded its Air Quality Health Advisory for fine particulate matter (PM2.5) to cover all regions of New York, with western portions of the state expected to experience the greatest impacts.

“Smoke and haze from Canadian wildfires are creating unhealthy air conditions,” Hochul said as she urged residents, particularly those with respiratory or heart conditions, to limit outdoor activity.

By midday, AirNow, the U.S. Environmental Protection Agency’s official air-quality reporting system, showed portions of New York City reaching the Red AQI category (151–200), classified as “Unhealthy,” meaning everyone may begin experiencing health effects while sensitive groups face greater risk. Other parts of the state remained in the Orange (“Unhealthy for Sensitive Groups”) category.

The smoke arrived during another intense summer heat wave. New York City Emergency Management and the Department of Health and Mental Hygiene warned residents that Wednesday would likely be the hottest day of the week, with temperatures approaching 100°F and heat index values between 102°F and 103°F. The National Weather Service forecast heat index readings reaching 104°F across portions of the metropolitan area, with temperatures remaining in the 90s through Friday.

To help residents reduce exposure, New York City distributed free KN95 masks at public library branches throughout the five boroughs. Mayor Zohran Mamdani encouraged residents experiencing breathing difficulties to remain indoors whenever possible and follow the same precautions recommended for the ongoing heat emergency.

The Grid Is the Business Story

Beyond the public health concerns, the combination of extreme heat and heavy electricity demand placed significant pressure on the regional power grid.

PJM Interconnection, the nation’s largest electric grid operator serving approximately 67 million people across 13 states and the District of Columbia, projected Wednesday’s peak electricity demand at roughly 164,553 megawatts (MW)—the highest load forecast of the week and within about 1,000 MW of its historic record.

PJM responded by issuing both a Maximum Generation Alert and a Load Management Alert for July 15.

The Maximum Generation Alert directs power plant operators to postpone maintenance and keep as many generating units available as possible. The Load Management Alert notifies customers participating in demand-response programs that they may be asked to reduce electricity consumption if system conditions worsen.

In addition, PJM expanded its Hot Weather Alert across its entire service territory through at least July 17.

To further strengthen system reliability, PJM requested emergency authority from the U.S. Department of Energy through July 21, seeking temporary relief from certain environmental operating limits and authorization to dispatch backup generating resources if necessary.

The request comes only weeks after PJM established a new all-time electricity demand record of approximately 168,158 MW on July 2, surpassing the previous record of 165,563 MW, which had stood since August 2, 2006.

During that earlier heat event, the New York Independent System Operator (NYISO) also declared an Energy Watch as high temperatures tightened reserve margins, although New York maintained reliable electric service throughout the event.

What It Costs

Extreme weather events increasingly carry measurable economic consequences.

During PJM’s July 2 demand record, day-ahead wholesale electricity prices exceeded $2,000 per megawatt-hour in portions of the system. The Western Hub benchmark settled at $1,222.75 per megawatt-hour, nearly three times comparable peak pricing seen during the summer of 2025.

Businesses purchasing electricity under variable-rate contracts or subject to demand charges can experience immediate increases in operating costs during such events.

Meanwhile, PJM’s most recent capacity auction cleared at a record $333.44 per megawatt-day, compared with just $28.92 three auctions earlier. Independent market monitor Monitoring Analytics estimated that approximately 63 percent of the increase is attributable to growing electricity demand from data centers, adding roughly $9.3 billion in costs ultimately borne by consumers and businesses.

Wildfire smoke and extreme heat also reduce productivity throughout the broader economy. Construction crews, delivery services, outdoor retailers and restaurants all face reduced operating hours and increased safety precautions.

Westchester County Health Commissioner Dr. Sherlita Amler urged employers whose employees must work outdoors to schedule frequent breaks, provide hydration and monitor workers for signs of heat-related illness.

Officials stressed that current forecasts do not indicate a repeat of the historic June 2023 Canadian wildfire event, when New York City’s AQI briefly reached 465, among the worst air quality readings ever recorded in the city.

JBizNews Desk | New York

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