Gas cooking

Gas cooktop with words Gas cooking and indoor air pollution - orangeGas cooking is highly in demand, sought after for the quick response time and precision with heating and cooling. The vast majority of our clients have a strong preference for gas cooking over either induction or regular electric cooking.

In recent years, studies have shown that gas stoves can be a significant source of indoor air pollution. When in use, the hood should always be in use to foster healthy ventilation. That part alone is often forgotten, but it turns out that gas ovens and cooktops may be polluting even when no one is cooking.

Health hazards of gas cooking

Last week, the New York Times published the findings of a Stanford Doerr School of Sustainability and PSE Healthy Energy, a non-profit), study which found that in the 87 homes with gas stoves tested in Colorado and California, benzene was detected in every home, both in the kitchen and beyond, after just 45 minutes of using either the oven at 350 degrees or a single stove burner.

Benzene is a cancer causing agent and no safe levels of exposure to it are known. It is worth saying again: benzene was produced by gas cooking in every tested case.

In about a third of the tested homes, the benzene level exceeded what would be found with second hand smoke. The study also suggests that the smaller the home, the worse the results.

And it lingered for hours.

You can find the New York Times article on it here. You can see the results on this site, too: Environmental Health News.

This isn’t the only place we can find warnings about gas cooking and air pollution. From the State of California, Indoor air pollution from cooking:

  • “Natural gas stoves can release carbon monoxide, formaldehyde and other harmful pollutants into the air, which can be toxic to people and pets.”
  • “If you have a gas stove, a qualified technician should inspect it every year for gas leaks and carbon monoxide.”

It’s not just gas cooking that produces indoor air pollution

(more…)

Residential Wood Burning: What You Can and Cannot Do

Fireplace with Lone Hill Quarry Stone.pngMore likely than not, you either own or have shopped for Silicon Valley homes with fireplaces. In that case, you’ve likely also heard tale about the new law that would force homeowners to replace older fireplaces with new gas only ones or decommission them entirely before selling. Let me quash those rumors now – homeowners with wood-burning fireplaces do not automatically need to replace them at the sale of the property at this time. But what’s behind the rumor anyway?

History

A few years ago, there were proposed regulations in place that were going to make stipulations for home sellers with older fireplace in the San Francisco Bay Area. Amendments have since been made to the ordinance, removing this requirement. These were part of Regulation 6, Rule 3: Wood-Burning Devices, which was adopted in July 2008 to regulate and improve air pollution levels for the health of the Bay Area community (Wood Burning Regulation). Its immediate effect was to enforce Winter Spare the Air Alerts and Mandatory Burn Bans.

The regulation also stated numerous rules that would be effective at future dates (mostly beginning November 1, 2015/6), including many that will be passed this year and in the future, up to 2020. So, while you don’t need to worry about replacing your fireplace before you sell, there’s plenty to be aware of when you use, replace, repair, and install your fireplace – and you may still need to replace it.

Pollution

Smokey sky from fire June 2008With 1.4 million woodstoves and fireplaces around the Bay Area, it’s no surprise they make up a major part in the region’s air pollution – approximately one third of winter pollution! That’s greater than the amount of pollution caused by vehicles. Burning solid fuels produces what is known as soot, or more scientifically, PM2.5, which stands for Particulate Matter with diameter of 2.5 microns or less (Ordinance). These particles in the air are a form of pollution which is so fine that when breathed in it can penetrate deep into the lungs and even enter the blood stream.

Wood smoke contains a group of compounds that are similar to second-hand cigarette smoke and are likewise hazardous (2012 flier). Studies show that this type of pollution can cause a variety of health conditions which can put undue stress on individuals with weak respiratory or cardiovascular systems.

Apparently 1 in 7 Bay Area residents has a respiratory condition, and these folks of course are more vulnerable to problems from pollution. Immediate effects might be watery eyes and coughing, while long-term exposure to polluted air can permanently harm lung function, capacity, and development – possibly instigating diseases like asthma and bronchitis. “Eliminating residential wood burning during a Winter Spare the Air Alert can reduce soot in the Bay Area by 35 tons each day” (Wood Burning Regulations Flier). On top of the particulate pollution, wood smoke also contains a variety of gases, including toxins like dioxin (Wood Burning Regulations Flier).

But why winter? What about summer barbeques? Weather is important in regard to the displacement of these polluters. Spare the Air Alerts are hardly ever called when it’s been raining. Cold, still weather conditions cause the smoky air to become trapped near the ground, allowing pollution to build up to unsafe levels (Flier). When a Spare the Air alert is not called but data indicates worsening conditions there may be an optional compliance health advisory in the form of a Recommended No-Burn Day. And as for summer barbeques – the weather conditions in summer are more prone to heightening levels of ozone than soot, so Summer Spare the Air Alerts are placed based on very different weather and pollution concerns.

Other than pollution, there are still plenty of reasons to not burn. Fires are not a very efficient form of heating, and many fireplaces actually rob your home of heat, sending hot air up the chimney and out of your home. Prevent heat loss (and the need to burn more fuel or crank the thermostat) by keeping your home well insulated and weatherized. Get more efficient heating with an EPA certified device or alternative natural gas or electric heater. (more…)