Mixing bleach and ammonia?
Here is the usual citation for the toxic products and symptoms created upon mixing NH3 and NaOCl (not in lab conditions, which involves employing very cold dilute aqueous solutions):

When bleach is mixed with ammonia, toxic gases called chloramines are produced. Exposure to chloramine gases can cause the following symptoms:
Coughing.
Nausea.
Shortness of breath.
Watery eyes.
Chest pain.
Irritation to the throat, nose, and eyes.
Wheezing.
Pneumonia and fluid in the lungs.

The chemistry proceeds along the lines:
$\ce{NaOCl ⇌ Na+ + OH- + HOCl}$
$\ce{NH3 + HOCl ⇌ NH2Cl (monochloramine) + H2O}$
$\ce{NH2Cl + HOCl ⇌ NHCl2 (dichloramine) + H2O}$
$\ce{NHCl2 + HOCl ⇌ NCl3 (trichloramine) + H2O}$
Wikipedia also cites possible disproportion paths in acidic conditions starting with monochloramine, to quote:

In an acidic medium at pH values of around 4, chloramine disproportionates to form dichloramine, which in turn disproportionates again at pH values below 3 to form nitrogen trichloride:
$\ce{2 NH2Cl + H+ ⇌ NHCl2 + NH4+}$
$\ce{3 NHCl2 + H+ ⇌ 2 NCl3 + NH4+}$
At low pH values, nitrogen trichloride dominates and at pH 3–5 dichloramine dominates. These equilibria are disturbed by the irreversible decomposition of both compounds:
$\ce{NHCl2 + NCl3 + 2 H2O → N2 + 3 HCl + 2 HOCl}$

Note, with respect to any formed nitrogen trichloride (appears as a yellow oily liquid), extreme caution as it is a very unstable explosive compound upon exposure to shock, heating, sunlight and organics, even while in aqueous solutions. Because of its dangerous sensitivity, $\ce{NCl3}$ is best avoided.
Also, with respect to exposure of swimmers where chloramine can be formed in non-chloramine pools from free chlorine interacting with amine groups present in organic substances, or chloramine treated pools employing NH2Cl as a disinfectant, especially in the case of indoor pools, per the same Wikipedia source:

There is also evidence that exposure to chloramine, can contribute to respiratory problems, including asthma, among swimmers.[11] Respiratory problems related to chloramine exposure are common and prevalent among competitive swimmers.[12]

On the question, can one safely disposed of aqueous NH2Cl? Be careful, as on just adding it to a water source may increase the solubility of heavy metals. This can result, for example, in Lead poisoning for animals and humans (see 'Chloramine Catch: Water Disinfectant Can Raise Lead Exposure).