No, 30% tint for windows is not legal in Ontario, specifically for the front side windows (the driver's window and the front passenger window). Ontario's window tinting regulations dictate that front side windows must allow at least 70% of visible light to pass through. While there are no specific restrictions on tint darkness for rear windows, the rules are stringent for front windows to ensure the safety of drivers and pedestrians by maintaining adequate visibility, particularly during nighttime and low-light conditions. Therefore, it is crucial to adhere to these regulations and opt for tints that meet the province's visibility requirements to avoid potential legal issues and fines.